increasing the size of available NonPagedPool memory

NTDEV
1

Is it possible to control the NonPagedPool memory size on a NT/Win2K box ?
My driver, which is used for a dedicated application, requires 64MB or more
of non-paged pool memory. However, on a 64MB system, the most that can be
successfully allocated is around 4MB (with other devices running). The
driver is manually loaded after user logs in.

I`ve seen an MSDN article (Q126402) on this topic but the solution
(modifying some registry values located under
HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management)
seem to involve some risks of getting an unbootable system.

Can anyone comment on the above method ? Other ideas on how to increase
NonPagedPool memory size ?

Thanks,

Alain

2

Your driver using a large non-paged pool takes a chunk of your
physical memory out of play.
Your other applications, and the OS have to make do
with whatever is left over. On a 64MB system, taking 64MB non-paged
memory would not leave any physical memory available to run
the OS, which I believe you need ;-).

Can anyone comment on the above method ? Other ideas on how to increase
NonPagedPool memory size ?

Add more physical memory?

3

Q126402 is correct about the method but I’m curious about how you expect to
get “64MB or more” of non-pageable memory on any operating system running on
a 64MB platform.

Mark Roddy
Windows 2000/NT Consultant
Hollis Technology Solutions
www.hollistech.com

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com]On Behalf Of Alain Clermont
Sent: Monday, August 14, 2000 3:16 PM
To: NT Developers Interest List
Subject: [ntdev] increasing the size of available NonPagedPool memory

Is it possible to control the NonPagedPool memory size on a NT/Win2K box ?
My driver, which is used for a dedicated application, requires
64MB or more
of non-paged pool memory. However, on a 64MB system, the most that can be
successfully allocated is around 4MB (with other devices running). The
driver is manually loaded after user logs in.

I`ve seen an MSDN article (Q126402) on this topic but the solution
(modifying some registry values located under
HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management)
seem to involve some risks of getting an unbootable system.

Can anyone comment on the above method ? Other ideas on how to increase
NonPagedPool memory size ?

Thanks,

Alain

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4

>I’m curious about how you expect to

get “64MB or more” of non-pageable memory on any operating system running
on
a 64MB platform.

That would be worth a patent, wouldn`t it ? :slight_smile:

The point that I tried to make is that, on a 64MB system, the most
NonPagedPool memory I can get right now is 4MB. This seems low since NT is
running on a basic devices/service configuration. Locking physical memory
is not a major issue in this case because we it is a dedicated acquisition
system.

So, I am inquiring the gurus out there on the possible methods available to
increase the available size of NonPagedPool mem, on NT4 and W2K.

Thanks,

Alain

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com]On Behalf Of Mark Roddy
Sent: Monday, August 14, 2000 6:16 PM
To: NT Developers Interest List
Subject: [ntdev] RE: increasing the size of available NonPagedPool
memory

Q126402 is correct about the method but I’m curious about how you expect to
get “64MB or more” of non-pageable memory on any operating system running on
a 64MB platform.

Mark Roddy
Windows 2000/NT Consultant
Hollis Technology Solutions
www.hollistech.com

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com]On Behalf Of Alain Clermont
Sent: Monday, August 14, 2000 3:16 PM
To: NT Developers Interest List
Subject: [ntdev] increasing the size of available NonPagedPool memory

Is it possible to control the NonPagedPool memory size on a NT/Win2K box ?
My driver, which is used for a dedicated application, requires
64MB or more
of non-paged pool memory. However, on a 64MB system, the most that can be
successfully allocated is around 4MB (with other devices running). The
driver is manually loaded after user logs in.

I`ve seen an MSDN article (Q126402) on this topic but the solution
(modifying some registry values located under
HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management)
seem to involve some risks of getting an unbootable system.

Can anyone comment on the above method ? Other ideas on how to increase
NonPagedPool memory size ?

Thanks,

Alain

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