hoonzang's CFPs: 25 new messages in 13 topics

microsoft.public.development.device.drivers
http://groups.google.com/group/microsoft.public.development.device.drivers?hl=en

microsoft.public.development.device.drivers@googlegroups.com

Today's topics:

==============================================================================
TOPIC: Howto increase NT kernel stack size? (if it is possible at all)
http://groups.google.com/group/microsoft.public.development.device.drivers/browse_thread/thread/b7782a4cbf9a71db?hl=en
==============================================================================

== 1 of 3 ==
Date: Wed, Mar 26 2008 9:53 pm
From: "David Craig"

Your design is bad. Reconsider. I heard from one person at Microsoft that
many have requested stack size increases for kernel mode drivers and the
kernel team said NO, NO WAY, NO HOW. There are some things that can
increase the stack size such as NTFS, and maybe some in the DirectX stack
(but I don't know about that), but not you. Describe the problem and what
design algorithms you are attempting to use that require that much stack
space. Using more than a few bytes per function for a kernel mode driver is
a very bad idea. Make that a VERY VERY VERY BAD BAD BAD IDEA!!!

"SergeV" <s_no_spam_v@a_ca.de_m.org> wrote in message
news:ewu0pJ8jIHA.4712@TK2MSFTNGP04.phx.gbl...
> (to that)
>
> Yea, Microsoft say:
> "the size of the kernel-mode stack on a given platform is set
> by the operating system and cannot be modified."
> this is clear.
>
>
> On the other hand, D.Probert (Microsoft) say:
> "kernel stacks.. can grow up to 64k.. in win64 .. 88k."
> http://www.i.u-tokyo.ac.jp/edu/training/ss/lecture/new-documents/Lectures/17-Win32K/Win32K.ppt
> (probably this is nothing about Windows NT/XP/2000. It is about
> Win32k.sys)
>
> Sorry if my questions sound silly.
> I try to find a way to do, not to find the reason why I can't do.
> Cheers.
> Sergei.
>

== 2 of 3 ==
Date: Thurs, Mar 27 2008 4:49 am
From: "Don Burn"

This was limited to extremely special circumstances with graphics subsystem
only IIRC. And even then it was a huge cause of crashes, fix your code.

--
Don Burn (MVP, Windows DDK)
Windows 2k/XP/2k3 Filesystem and Driver Consulting
Website: http://www.windrvr.com
Blog: http://msmvps.com/blogs/WinDrvr
Remove StopSpam to reply

== 3 of 3 ==
Date: Thurs, Mar 27 2008 10:09 am
From: "Maxim S. Shatskih"

> On the other hand (-: they say :-) DirectX somehow manage to increase
> kernel stack size to 64k,

Any GUI apps (after first call to win32k) have this increase.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com

==============================================================================
TOPIC: Memory related questions
http://groups.google.com/group/microsoft.public.development.device.drivers/browse_thread/thread/43363f6f3e814cf1?hl=en
==============================================================================

== 1 of 2 ==
Date: Thurs, Mar 27 2008 2:33 am
From: Deepakumar

Thanks Maxim,
>
> > 2. Can any allocation be there in paged/nonpaged memory without tag (even
> > without wdm/ddk tag)?
>
> No. Default tag is substituted.
>
I asked this because I saw a contradictory measurement on memory allocation
in paged pool. The !vm shows that memory allocated in paged pool is 160MB
PagedPool Usage: 40960 ( 163840 Kb)
But the sum of all the paged pool used (!poolused 4) gives around 125MB. So
where is the remaning 35Mb?

> Mapped user buffers are not pool at all, and they are nonpaged.
>
Then in which kernel address space they are getting mapped?

== 2 of 2 ==
Date: Thurs, Mar 27 2008 10:11 am
From: "Maxim S. Shatskih"

> > Mapped user buffers are not pool at all, and they are nonpaged.
> >
> Then in which kernel address space they are getting mapped?

In the system PTEs area, same as used by MmMapIoSpace.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com

==============================================================================
TOPIC: IoGetDeviceProperty returns STATUS_OBJECT_NAME_NOT_FOUND
http://groups.google.com/group/microsoft.public.development.device.drivers/browse_thread/thread/48751d4f28d42bae?hl=en
==============================================================================

== 1 of 4 ==
Date: Thurs, Mar 27 2008 3:19 am
From: francois

In the AddDevice() handler from our driver for USB device, we call the
IoGetDeviceProperty() and it returns STATUS_OBJECT_NAME_NOT_FOUND.

We use the same PhysicalDeviceObject given as a parameter in the
AddDevice() handler.

Can you see one possible reason for this ?

Our driver is BDA driver with USB WDM lower edge. The strange thing is
that problem occurs only on Windows 2000 platform with USB composite
device. On Windows XP/Vista, or if the device exposes only one single
USB interface, the call to IoGetDeviceProperty() is successful.

Thanks for your help
Francois

== 2 of 4 ==
Date: Thurs, Mar 27 2008 7:23 am
From: chris.aseltine@gmail.com

On Mar 27, 5:19 am, francois <fkanounnik...@yahoo.fr> wrote:

> Our driver is BDA driver with USB WDM lower edge. The strange thing is
> that problem occurs only on Windows 2000 platform with USB composite
> device. On Windows XP/Vista, or if the device exposes only one single
> USB interface, the call to IoGetDeviceProperty() is successful.

Which property are you trying to pull?

== 3 of 4 ==
Date: Thurs, Mar 27 2008 7:52 am
From: francois

We are trying to pull "DevicePropertyBusTypeGuid" property

== 4 of 4 ==
Date: Thurs, Mar 27 2008 11:25 am
From: "Doron Holan [MSFT]"

is it a multi function device and usbccgp is your parent driver?

--
Please do not send e-mail directly to this alias. this alias is for
newsgroup purposes only.
This posting is provided "AS IS" with no warranties, and confers no rights.

"francois" <fkanounnikoff@yahoo.fr> wrote in message
news:9f7069d1-654f-4457-a75f-6b787a8a41c5@d4g2000prg.googlegroups.com...
> We are trying to pull "DevicePropertyBusTypeGuid" property
>

==============================================================================
TOPIC: WINDDK help fails to start w/ cannot open the file ...\winddk.col
http://groups.google.com/group/microsoft.public.development.device.drivers/browse_thread/thread/4bd8dc3635e54e16?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Mar 27 2008 1:35 am
From: ht_it

sirip wrote:
> *When I try to start WINDDK documentation from Programs->Development
> Kits->Windows DDK 3790.1830->Help->DDK Documentation, it fails with
> following
> error
>
> Cannot open the file : C:\WINDDK\3790~1.183\help\winddk.col
>
> Any help would be very much appreciated. I've tried complete
> un-installing,
> making sure there is no C:\WINDDK left and re-installing. Didn't
> help.
>
> thank you *

Hello sirip,
How to complete un-installing ddk?please help!Thanks.

--
ht_it
------------------------------------------------------------------------
Posted via http://www.codecomments.com
------------------------------------------------------------------------

==============================================================================
TOPIC: Handle call to FlushFileBuffers in UMDF driver
http://groups.google.com/group/microsoft.public.development.device.drivers/browse_thread/thread/05dca16dd45b3156?hl=en
==============================================================================

== 1 of 2 ==
Date: Thurs, Mar 27 2008 4:57 am
From: Andre

Hi,

I tried to work around this UMDF restriction. At this I am using a KMDF
lower filter driver, which is supposed to handle the IRP_MJ_FLUSH_BUFFERS. In
the FilterEvtDeviceAdd function I have registered an IRP preprocess callback
like it is done in the KMDF serial sample:

status = WdfDeviceInitAssignWdmIrpPreprocessCallback(DeviceInit,
SerialFlush, IRP_MJ_FLUSH_BUFFERS, NULL, 0);

The return status is OK. However, the registered callback is never called. I
have used IrpTracker (from OSR) which indicates that the FLUSH_BUFFERS IRP is
completed by \Driver\WudfRd with completion status "NOT_SUPPORTED". In the
book "Developing Drivers with the WDF" (P. Orwick, G. Smith, page 503) I
found the information that the reflector passes IRPs of unsupported type to
the next-lower driver in the kernel-mode device stack.

So why does the reflector complete the IRP instead of passing it to the
filter driver?

Thanks and best regards,
Andre

"Doron Holan [MSFT]" wrote:

> cannot be done in UMDF, the kernel mode reflector does not reflect flush
> buffers into the user mode driver host
>
> d
>
> --
> Please do not send e-mail directly to this alias. this alias is for
> newsgroup purposes only.
> This posting is provided "AS IS" with no warranties, and confers no rights.
>
>
> "Andre" <Andre@discussions.microsoft.com> wrote in message
> news:6B90D442-13E4-4700-929D-E8BBF2CC3DB9@microsoft.com...
> > Hi,
> >
> > I have a UMDF driver which creates a virtual serial COM port. An
> > application, which calls FlushFileBuffers with a handle to this COM port,
> > receives error 50, which indicates that this request is not supported. The
> > driver for the normal COM port, however, supports a call to
> > FlushFileBuffers,
> > at least this call does not fail. In the KMDF serial port driver example
> > one
> > can find that it handles IRP_MJ_FLUSH_BUFFERS. So I guess I need to
> > implement
> > the corresponding interface in UMDF. However, I was not able to find it.
> > Which interface must be implemented to handle IRP_MJ_FLUSH_BUFFERS.
> >
> > Thanks for any suggestions and best regards,
> > Andre
> >
> >
> >
>
>

== 2 of 2 ==
Date: Thurs, Mar 27 2008 10:09 am
From: "Maxim S. Shatskih"

Use some IOCTL instead of flush buffers.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com

"Andre" <Andre@discussions.microsoft.com> wrote in message
news:A5284E93-E0C3-46F7-9FF7-CEB3DECE951E@microsoft.com...
> Hi,
>
> I tried to work around this UMDF restriction. At this I am using a KMDF
> lower filter driver, which is supposed to handle the IRP_MJ_FLUSH_BUFFERS. In
> the FilterEvtDeviceAdd function I have registered an IRP preprocess callback
> like it is done in the KMDF serial sample:
>
> status = WdfDeviceInitAssignWdmIrpPreprocessCallback(DeviceInit,
> SerialFlush, IRP_MJ_FLUSH_BUFFERS, NULL, 0);
>
> The return status is OK. However, the registered callback is never called. I
> have used IrpTracker (from OSR) which indicates that the FLUSH_BUFFERS IRP is
> completed by \Driver\WudfRd with completion status "NOT_SUPPORTED". In the
> book "Developing Drivers with the WDF" (P. Orwick, G. Smith, page 503) I
> found the information that the reflector passes IRPs of unsupported type to
> the next-lower driver in the kernel-mode device stack.
>
> So why does the reflector complete the IRP instead of passing it to the
> filter driver?
>
> Thanks and best regards,
> Andre
>
>
> "Doron Holan [MSFT]" wrote:
>
> > cannot be done in UMDF, the kernel mode reflector does not reflect flush
> > buffers into the user mode driver host
> >
> > d
> >
> > --
> > Please do not send e-mail directly to this alias. this alias is for
> > newsgroup purposes only.
> > This posting is provided "AS IS" with no warranties, and confers no rights.
> >
> >
> > "Andre" <Andre@discussions.microsoft.com> wrote in message
> > news:6B90D442-13E4-4700-929D-E8BBF2CC3DB9@microsoft.com...
> > > Hi,
> > >
> > > I have a UMDF driver which creates a virtual serial COM port. An
> > > application, which calls FlushFileBuffers with a handle to this COM port,
> > > receives error 50, which indicates that this request is not supported.
The
> > > driver for the normal COM port, however, supports a call to
> > > FlushFileBuffers,
> > > at least this call does not fail. In the KMDF serial port driver example
> > > one
> > > can find that it handles IRP_MJ_FLUSH_BUFFERS. So I guess I need to
> > > implement
> > > the corresponding interface in UMDF. However, I was not able to find it.
> > > Which interface must be implemented to handle IRP_MJ_FLUSH_BUFFERS.
> > >
> > > Thanks for any suggestions and best regards,
> > > Andre
> > >
> > >
> > >
> >
> >

==============================================================================
TOPIC: Problem with reading from two drivers in Windows Service
http://groups.google.com/group/microsoft.public.development.device.drivers/browse_thread/thread/f16592f2b6720c67?hl=en
==============================================================================

== 1 of 2 ==
Date: Thurs, Mar 27 2008 5:12 am
From: "KBJ"

Hello,
> Have you tried attaching the kernel debugger (windbg) to the crashing
> machine and see where it crashes?

Yes, I'm getting the following error:

*** Fatal System Error: 0x0000004e
(0x00000007,0x00001A83,0x00000002,0x00000000)

Thu Mar 27 13:04:32.082 2008 (GMT+1): Break instruction exception - code
80000003 (first chance)

A fatal system error has occurred.
Debugger entered on first try; Bugcheck callbacks have not been invoked.

A fatal system error has occurred.

Connected to Windows XP 2600 x86 compatible target, ptr64 FALSE
Loading Kernel Symbols
.........................................................................................
Loading User Symbols

Loading unloaded module list
.....
*******************************************************************************
*
*
* Bugcheck Analysis
*
*
*
*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck 4E, {7, 1a83, 2, 0}

Probably caused by : memory_corruption

Followup: memory_corruption
---------

nt!RtlpBreakWithStatusInstruction:
804e3b25 cc int 3
kd> !analyze -v
*******************************************************************************
*
*
* Bugcheck Analysis
*
*
*
*******************************************************************************

PFN_LIST_CORRUPT (4e)
Typically caused by drivers passing bad memory descriptor lists (ie: calling
MmUnlockPages twice with the same list, etc). If a kernel debugger is
available get the stack trace.
Arguments:
Arg1: 00000007, A driver has unlocked a page more times than it locked it
Arg2: 00001a83, page frame number
Arg3: 00000002, current share count
Arg4: 00000000, 0

Debugging Details:
------------------

BUGCHECK_STR: 0x4E_7

DEFAULT_BUCKET_ID: CODE_CORRUPTION

PROCESS_NAME: System

IRP_ADDRESS: 8149f008

LAST_CONTROL_TRANSFER: from 805328e7 to 804e3b25

SYMBOL_ON_RAW_STACK: 1

STACK_ADDR_RAW_STACK_SYMBOL: fffffffff97094e8

STACK_COMMAND: dds F97094E8-0x20 ; kb

STACK_TEXT:
f97094c8 f9709970
f97094cc 80504e4d nt!MiCleanSection+0x6bd
f97094d0 e15165a0
f97094d4 00000001
f97094d8 00000000
f97094dc 00000000
f97094e0 00000000
f97094e4 f64cf8a4 mrxdav!_NULL_IMPORT_DESCRIPTOR+0x3c
f97094e8 f64a7000 mrxdav!MrxDAVEfsControlCompletion <PERF> (mrxdav+0x0)
f97094ec 805a758e nt!MiSnapThunk+0x6f
f97094f0 814a8500
f97094f4 f64d035e mrxdav!_NULL_IMPORT_DESCRIPTOR+0xaf6
f97094f8 000000ff
f97094fc f64cf8a4 mrxdav!_NULL_IMPORT_DESCRIPTOR+0x3c
f9709500 f64adaa8 mrxdav!_imp__GetSecurityUserInfo
f9709504 805a7701 nt!MiSnapThunk+0x382
f9709508 816c6290
f970950c 00000000
f9709510 f64a7000 mrxdav!MrxDAVEfsControlCompletion <PERF> (mrxdav+0x0)
f9709514 f970991c
f9709518 f64adaa8 mrxdav!_imp__GetSecurityUserInfo
f970951c 804f2d87 nt!MiRemoveMappedView+0x253
f9709520 816c6260
f9709524 817cca00
f9709528 f995a958 KSecDD!DESParityTable <PERF> (KSecDD+0x14958)
f970952c 00000000
f9709530 0000000e
f9709534 f64d0372 mrxdav!_NULL_IMPORT_DESCRIPTOR+0xb0a
f9709538 00000000
f970953c 00000000
f9709540 00000000
f9709544 00040100

CHKIMG_EXTENSION: !chkimg -lo 50 -d !nt
804d910c - nt!KiXMMIZeroPage+73
[ fb:90 ]
804d9112-804d9115 4 bytes - nt!KiXMMIZeroPage+79 (+0x06)
[ 57 ff ff ff:dd e7 0e 01 ]
804d9545-804d954a 6 bytes - nt!ExAcquireResourceSharedLite+10 (+0x433)
[ fa 8b 75 08 33 db:e9 13 e4 0e 01 cc ]
804d9564 - nt!ExAcquireResourceSharedLite+98 (+0x1f)
[ fb:90 ]
804d9569-804d9570 8 bytes - nt!ExAcquireResourceSharedLite+b8 (+0x05)
[ c2 08 00 90 90 90 90 90:e9 63 ab 10 01 c2 08 00 ]
804dbb82 - nt!ExReleaseResourceLite+ba (+0x2619)
[ 99:3f ]
804dbb94 - nt!ExReleaseResourceLite+c8 (+0x12)
[ 87:2d ]
804dbba0 - nt!ExReleaseResourceLite+d0 (+0x0c)
[ 7e:24 ]
804dbbc5-804dbbcd 9 bytes - nt!ExReleaseResourceLite+f5 (+0x25)
[ 90 90 90 90 90 90 90 90:e9 f1 84 10 01 5f 5e 5b ]
804dbbd5-804dbbda 6 bytes - nt!ExReleaseResourceLite+5 (+0x10)
[ 64 a1 24 01 00 00:e9 64 bd 0e 01 cc ]
804dbbe8 - nt!ExReleaseResourceLite+18 (+0x13)
[ 36:dc ]
804dbbf9 - nt!ExReleaseResourceLite+29 (+0x11)
[ 25:cb ]
804dbc16-804dbc1a 5 bytes - nt!ExReleaseResourceLite+75 (+0x1d)
[ 66 81 e2 7f ff:e9 11 bd 0e 01 ]
804deff2-804deff8 7 bytes - nt!KiFastCallEntry+7f (+0x33dc)
[ c7 45 08 00 0d db ba:e9 06 89 0e 01 cc cc ]
804df07c-804df080 5 bytes - nt!KiServiceExit (+0x8a)
[ fa f7 45 70 00:e9 7c 50 10 01 ]
804df16b-804df16d 3 bytes - nt!KiSystemCallExitBranch+2 (+0xef)
[ 5a 59 9d:c8 02 04 ]
804e34b4-804e34b8 5 bytes - nt!ExfInterlockedInsertHeadList+1 (+0x4349)
[ fa 8b 01 89 02:e9 f3 43 0e 01 ]
804e34d1-804e34d6 6 bytes - nt!ExfInterlockedInsertTailList+1 (+0x1d)
[ fa 8b 41 04 89 0a:e9 f9 43 0e 01 cc ]
804e34f2-804e34f6 5 bytes - nt!ExfInterlockedRemoveHeadList+1 (+0x21)
[ fa 8b 01 3b c1:e9 8d 43 0e 01 ]
804e3b4c-804e3b50 5 bytes - nt!ExAcquireResourceExclusiveLite+7
(+0x65a)
[ 64 a1 24 01 00:e9 19 05 10 01 ]
804e3b6d-804e3b71 5 bytes - nt!ExAcquireResourceExclusiveLite+47
(+0x21)
[ 89 46 1c 66 89:e9 16 05 10 01 ]
804e9175-804e917a 6 bytes - nt!ExAcquireSharedWaitForExclusive+10
(+0x5608)
[ fa 8b 75 08 33 db:e9 d4 e7 0d 01 cc ]
804e9194 - nt!ExAcquireSharedWaitForExclusive+ae (+0x1f)
[ fb:90 ]
804e9199-804e91a0 8 bytes - nt!ExAcquireSharedWaitForExclusive+ef
(+0x05)
[ c2 08 00 90 90 90 90 90:0f c7 c8 02 03 c2 08 00 ]
804ed809-804ed80f 7 bytes - nt!CcGetActiveVacb+5 (+0x4670)
[ fa 8b 45 08 8b 48 48:e9 5e a1 0d 01 cc cc ]
804ef1dc-804ef1e3 8 bytes - nt!CcSetActiveVacb+7 (+0x19d3)
[ fa 8b 45 08 83 78 48 00:e9 e0 87 0d 01 cc cc cc ]
804ef1ff-804ef20c 14 bytes - nt!CcSetActiveVacb+a3 (+0x23)
[ 8b 0a 89 48 48 89 58 50:e9 ad 87 0d 01 e9 9c 87 ]
130 errors : !nt (804d910c-804ef20c)

MODULE_NAME: memory_corruption

IMAGE_NAME: memory_corruption

FOLLOWUP_NAME: memory_corruption

DEBUG_FLR_IMAGE_TIMESTAMP: 0

MEMORY_CORRUPTOR: LARGE

FAILURE_BUCKET_ID: MEMORY_CORRUPTION_LARGE

BUCKET_ID: MEMORY_CORRUPTION_LARGE

Followup: memory_corruption
---------

--
Regards
KBJ

== 2 of 2 ==
Date: Thurs, Mar 27 2008 10:13 am
From: "Maxim S. Shatskih"

> When i try to read from two drivers (NDIS IM & TDI) in one Windows (XP)
> Service, Windows is crashing (PFN_LIST_CORRUPT (4e)).

MDL mismanagement usually.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com

==============================================================================
TOPIC: hula girl cigar company tonya cooley cyber girl bike daytona girl
http://groups.google.com/group/microsoft.public.development.device.drivers/browse_thread/thread/6c48af5e02684f90?hl=en
==============================================================================

== 1 of 1 ==
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==============================================================================
TOPIC: vhidmini.pnf is needed using filemon
http://groups.google.com/group/microsoft.public.development.device.drivers/browse_thread/thread/375baa318e3efa2b?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Mar 27 2008 11:05 pm
From: "pico"

this didn't answer me.

it says:

E:\vhidmini>devcon install vhidmini.inf
"{D49F883C-6486-400a-8C22-1A9EF48577E4}\HID_DEVICE"
Device node created. Install is complete when drivers are updated...
Updating drivers for devcon failed.

I want to know how I should watch the real problem.

TIA

"Doron Holan [MSFT]" <doronh@online.microsoft.com> wrote in message
news:OeiGBG4jIHA.2396@TK2MSFTNGP05.phx.gbl...
> if the PNF is not present it is not an error. look at the logs to see why
> the udpate failed instead of trying to guess
>
> d
>
> --
> Please do not send e-mail directly to this alias. this alias is for
> newsgroup purposes only.
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
>
>
> "pico" <webmaster@pico.com> wrote in message
> news:e9qUPt0jIHA.3512@TK2MSFTNGP03.phx.gbl...
>>I want to use devcon to install vhidmini sample driver according to reame.
>>
>> but it claims update failed always. so I use filemon to check which file
>> it is accessing,
>> found that vhidmini.pnf.
>>
>> this is generated by setup application when installing, why it didn't do
>> that?
>>
>>
>> TIA
>>
>

==============================================================================
TOPIC: KMDF Usb Multiple Configuration
http://groups.google.com/group/microsoft.public.development.device.drivers/browse_thread/thread/0d721e11f150713c?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Mar 27 2008 7:25 am
From: chris.aseltine@gmail.com

On Mar 26, 7:36 am, siddu <siddu.k...@gmail.com> wrote:

> I am writing a driver for USB to Serial device in KMDF, which has 2
> configurations. After selecting 1 configuration and downloading the firmware,
> i am not able to switch to 2 configuration. I want to know whether KMDF
> supports multiple configurations and how to select the required configuration.

I would just use a separate PID (and USB configuration #0) for the
"firmware loaded" configuration.

==============================================================================
TOPIC: mapping device memory to userspace through MDL direct io inter
http://groups.google.com/group/microsoft.public.development.device.drivers/browse_thread/thread/cd0b9239515f7fff?hl=en
==============================================================================

== 1 of 2 ==
Date: Thurs, Mar 27 2008 7:30 am
From: kota

Hi Gary,

Thanks for very quick & short reply, could you be little more brief about
your suggestions (or) plz provide any link about your suggesting for mapping
kernel device memory to user space.

I am currently following the method suggested in below paper:
http://www.microsoft.com/whdc/driver/kernel/mem-mgmt.mspx
But instead of getting the virtual kernel address space, i am taking user
virtual address space from below function:
MmMapLockedPagesSpecifyCache
After looking to the below article, i modified the code:

http://www.osronline.com/article.cfm?id=423
Instead of using MmBuildNonPagedPool, i used MmMapLockedPages, with this
method, i could map the memory till 1MB, where as it was working only 100KB
with earlier method.
if i increase the memory limit more than this, i am getting the bluse screen
with same info.

== 2 of 2 ==
Date: Thurs, Mar 27 2008 7:33 am
From: "Don Burn"

And as Gary asked why do you think you need this? What problem are you
trying to solve, that can justify the security problems you are creating
with this approach? What is the characteristics of your device that need
the level of performance that can only be justified by this?

--
Don Burn (MVP, Windows DDK)
Windows 2k/XP/2k3 Filesystem and Driver Consulting
Website: http://www.windrvr.com
Blog: http://msmvps.com/blogs/WinDrvr
Remove StopSpam to reply

"kota" <kota@discussions.microsoft.com> wrote in message
news:04A19F1C-ECB3-411C-94BF-33C83B0FE85C@microsoft.com...
> Hi Gary,
>
> Thanks for very quick & short reply, could you be little more brief about
> your suggestions (or) plz provide any link about your suggesting for
> mapping
> kernel device memory to user space.
>
> I am currently following the method suggested in below paper:
> http://www.microsoft.com/whdc/driver/kernel/mem-mgmt.mspx
> But instead of getting the virtual kernel address space, i am taking user
> virtual address space from below function:
> MmMapLockedPagesSpecifyCache
> After looking to the below article, i modified the code:
> http://www.osronline.com/article.cfm?id=423
> Instead of using MmBuildNonPagedPool, i used MmMapLockedPages, with this
> method, i could map the memory till 1MB, where as it was working only
> 100KB
> with earlier method.
> if i increase the memory limit more than this, i am getting the bluse
> screen
> with same info.
>
>>

==============================================================================
TOPIC: KeAcquireSpinLock or KeAcquireSpinLickAtDpc?
http://groups.google.com/group/microsoft.public.development.device.drivers/browse_thread/thread/9b7bd6d6295f6eaa?hl=en
==============================================================================

== 1 of 4 ==
Date: Thurs, Mar 27 2008 8:06 am
From: Uv

On Mar 26, 5:11 pm, Raj <R...@discussions.microsoft.com> wrote:
> I have a function that uses KeAcquireSpinLock(). This function will be called
> for each packet in a data stream at DISPATCH_LEVEL and I was interested to
> tune the performance. Then I read documentation that KeAcquireSpinLockAtDpc()
> will improve performance. I also want to use this function in few places
> where it rarely be called at " less than DISPATCH Irql".
>
> I am thinking of using KeGetCurrentIrql() to decide whether I use
> KeAcquireSpinLock() or KeAcquireSpinLockAtDpc(). I am not sure if I should
> bother to do this or simply always use KeAcquireSpinLock(). Is the
> performance be considerable to use conditional KeAcquireSpinLockAtDpc() ?
>
> Thanks,
> Raj

Optimizations such as the one you are proposing will affect the total
throughput only if the code path is under high contention.
Otherwise, the general rule is to improve the design to get better
performance and not depend on micro-optimizations.

Regards,
UV

== 2 of 4 ==
Date: Thurs, Mar 27 2008 8:13 am
From: "Don Burn"

Actually, IIRC KeGetCurrentIrql() is expensive enough that it will probably
decrease performance.

--
Don Burn (MVP, Windows DDK)
Windows 2k/XP/2k3 Filesystem and Driver Consulting
Website: http://www.windrvr.com
Blog: http://msmvps.com/blogs/WinDrvr
Remove StopSpam to reply

"Uv" <yuvraaj@gmail.com> wrote in message
news:70050799-892a-4bfd-bb6d-466b21945007@h11g2000prf.googlegroups.com...
> On Mar 26, 5:11 pm, Raj <R...@discussions.microsoft.com> wrote:
>> I have a function that uses KeAcquireSpinLock(). This function will be
>> called
>> for each packet in a data stream at DISPATCH_LEVEL and I was interested
>> to
>> tune the performance. Then I read documentation that
>> KeAcquireSpinLockAtDpc()
>> will improve performance. I also want to use this function in few places
>> where it rarely be called at " less than DISPATCH Irql".
>>
>> I am thinking of using KeGetCurrentIrql() to decide whether I use
>> KeAcquireSpinLock() or KeAcquireSpinLockAtDpc(). I am not sure if I
>> should
>> bother to do this or simply always use KeAcquireSpinLock(). Is the
>> performance be considerable to use conditional KeAcquireSpinLockAtDpc() ?
>>
>> Thanks,
>> Raj
>
> Optimizations such as the one you are proposing will affect the total
> throughput only if the code path is under high contention.
> Otherwise, the general rule is to improve the design to get better
> performance and not depend on micro-optimizations.
>
> Regards,
> UV

== 3 of 4 ==
Date: Thurs, Mar 27 2008 10:17 am
From: "Maxim S. Shatskih"

>Then I read documentation that KeAcquireSpinLockAtDpc()
> will improve performance. I also want to use this function in few places
> where it rarely be called at " less than DISPATCH Irql".

In these places, use KeRaiseIrql and the KeAcquireSpinLockAtDpcLevel.

In usual places, use KeAcquireSpinLockAtDpcLevel alone.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com

== 4 of 4 ==
Date: Thurs, Mar 27 2008 11:24 am
From: "Doron Holan [MSFT]"

it comes down to a simple litmus test

1) if you know you are at dispatch level, the AtDpc version will be faster
b/c there is no IRQL get and possible set.
2) otherwise, if you do no not know for sure, just call KeAcquireSpinLock.
internally it will call KeGetCurrentIrql to know if it needs to raise to
dispatch level, so if you check for current irql first and you are at
passive level, you get worse performance b/c KeGetCurrentIrql is called
twice

--
Please do not send e-mail directly to this alias. this alias is for
newsgroup purposes only.
This posting is provided "AS IS" with no warranties, and confers no rights.

"Raj" <Raj@discussions.microsoft.com> wrote in message
news:8611CC23-B6C0-42BC-91DE-EC0AAA411FC0@microsoft.com...
>I have a function that uses KeAcquireSpinLock(). This function will be
>called
> for each packet in a data stream at DISPATCH_LEVEL and I was interested to
> tune the performance. Then I read documentation that
> KeAcquireSpinLockAtDpc()
> will improve performance. I also want to use this function in few places
> where it rarely be called at " less than DISPATCH Irql".
>
> I am thinking of using KeGetCurrentIrql() to decide whether I use
> KeAcquireSpinLock() or KeAcquireSpinLockAtDpc(). I am not sure if I should
> bother to do this or simply always use KeAcquireSpinLock(). Is the
> performance be considerable to use conditional KeAcquireSpinLockAtDpc() ?
>
> Thanks,
> Raj

==============================================================================
TOPIC: Accessing card in USB card reader
http://groups.google.com/group/microsoft.public.development.device.drivers/browse_thread/thread/48d68577757b4af7?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Mar 27 2008 10:13 am
From: "Maxim S. Shatskih"

No ways except the ones proprietary for this particular reader, and even
they are possibly nonexistent.

--
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
maxim@storagecraft.com
http://www.storagecraft.com

"anonymous" <anonymous@discussions.microsoft.com> wrote in message
news:F45DE756-660E-4CE1-B348-CBA81BBEA555@microsoft.com...
> I would like to issue an ATA Identity command to a CF card in a USB card
> reader. I understand that card readers in general (and in this specific case)
> are using USBSTOR.SYS which is a SCSI interface, so unless I were to make my
> own driver and have support for that in the unit, I really can't do that.
>
> What I can do is send SCSI commands down to the unit, but when I use SCSI
> passthrough and ask for the identity, I get the identity of the card reader
> and not the card.
>
> Wondering if anyone in this group knows how to access to the card. I
> understand its possibly vendor specific, but figured it worth a shot here.

==============================================================================
TOPIC: Drive letter from WdfDeviceCreateSymbolicLink not removed when driver
unloads
http://groups.google.com/group/microsoft.public.development.device.drivers/browse_thread/thread/2331bc4826a8a821?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Mar 27 2008 10:14 am
From: Kevin

Hi,

I'm building something like the ramdisk example in the WinDDK. It uses
WdfDeviceCreateSymbolicLink to attach to a drive letter. The problem is
that when the driver unloads, the drive letter doesn't completely go
away. It remains in Windows Explorer as a disk with a red circle and a
white question mark in the middle. The "Map Network Drive" wizard shows
the drive letter as available. It completely disappears from explorer
after a reboot.

Any ideas? I want it to go away completely after the driver unloads.

Regards,
Kevin

==============================================================================

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hoonzang's CFPs

2008-03-27

25 new messages in 13 topics - digest

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hoonzang's CFPs

2008-03-27

25 new messages in 13 topics - digest

No comments:

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