Nonpaged Pool Memory Limitation
in [Device Drivers]
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From: uba on 17 Mar 2010 08:07 Hi All, I want to allocate two 1MB non-paged pool memories in my driver (using ExAllocatePoolWithTag). one for read and other for write. I would like to know what is the limitation of nonpaged pool. Is this dependent on physical memory? Actually, I have the option of using single 1MB pool both for writes and reads. I would like to know if the system be degraded (in terms of performance or anything else) if I use two pool memories instead of one pool memory? Thanks and Regards, Kid
From: Doron Holan [MSFT] on 17 Mar 2010 17:32 previous to Vista, there is a hard coded limit on NP pool. that limit is also affected by the amount of physical memory. why do you need such large buffers? if you can get away with less, use less, the system will benefit from more available physical pages. d -- This posting is provided "AS IS" with no warranties, and confers no rights. "uba" <kid07.uba(a)gmail.com> wrote in message news:59748e66-9f4c-43af-9437-34e332c05f52(a)a16g2000pre.googlegroups.com... > Hi All, > > I want to allocate two 1MB non-paged pool memories in my driver (using > ExAllocatePoolWithTag). one for read and other for write. > I would like to know what is the limitation of nonpaged pool. Is this > dependent on physical memory? > > Actually, I have the option of using single 1MB pool both for writes > and reads. I would like to know if the system be degraded (in terms of > performance or anything else) if I use two pool memories instead of > one pool memory? > > Thanks and Regards, > Kid
From: Alexander Grigoriev on 17 Mar 2010 21:54 On the grand scheme of things, 2 MB is nothing even for a 5 years old system. "uba" <kid07.uba(a)gmail.com> wrote in message news:59748e66-9f4c-43af-9437-34e332c05f52(a)a16g2000pre.googlegroups.com... > Hi All, > > I want to allocate two 1MB non-paged pool memories in my driver (using > ExAllocatePoolWithTag). one for read and other for write. > I would like to know what is the limitation of nonpaged pool. Is this > dependent on physical memory? > > Actually, I have the option of using single 1MB pool both for writes > and reads. I would like to know if the system be degraded (in terms of > performance or anything else) if I use two pool memories instead of > one pool memory? > > Thanks and Regards, > Kid
From: Doron Holan [MSFT] on 18 Mar 2010 15:59 not true. those 2 MB are now not available for general usage which means apps will hit the swap file faster, etc d -- This posting is provided "AS IS" with no warranties, and confers no rights. "Alexander Grigoriev" <alegr(a)earthlink.net> wrote in message news:enODr3jxKHA.3560(a)TK2MSFTNGP02.phx.gbl... > On the grand scheme of things, 2 MB is nothing even for a 5 years old > system. > > "uba" <kid07.uba(a)gmail.com> wrote in message > news:59748e66-9f4c-43af-9437-34e332c05f52(a)a16g2000pre.googlegroups.com... >> Hi All, >> >> I want to allocate two 1MB non-paged pool memories in my driver (using >> ExAllocatePoolWithTag). one for read and other for write. >> I would like to know what is the limitation of nonpaged pool. Is this >> dependent on physical memory? >> >> Actually, I have the option of using single 1MB pool both for writes >> and reads. I would like to know if the system be degraded (in terms of >> performance or anything else) if I use two pool memories instead of >> one pool memory? >> >> Thanks and Regards, >> Kid > >
From: Alexander Grigoriev on 18 Mar 2010 21:22 I'd give up 200 MB of RAM if the cache manager stopped kicking the code pages out in favor of regular files. THIS is why the apps hit the swap. Hitting the swap 2 MB earlier of later is way below the cache manager noise level. "Doron Holan [MSFT]" <doron.holan(a)online.microsoft.com> wrote in message news:umDmYWtxKHA.5576(a)TK2MSFTNGP05.phx.gbl... > not true. those 2 MB are now not available for general usage which means > apps will hit the swap file faster, etc > > d > > -- > > This posting is provided "AS IS" with no warranties, and confers no > rights. > > > "Alexander Grigoriev" <alegr(a)earthlink.net> wrote in message > news:enODr3jxKHA.3560(a)TK2MSFTNGP02.phx.gbl... >> On the grand scheme of things, 2 MB is nothing even for a 5 years old >> system. >> >> "uba" <kid07.uba(a)gmail.com> wrote in message >> news:59748e66-9f4c-43af-9437-34e332c05f52(a)a16g2000pre.googlegroups.com... >>> Hi All, >>> >>> I want to allocate two 1MB non-paged pool memories in my driver (using >>> ExAllocatePoolWithTag). one for read and other for write. >>> I would like to know what is the limitation of nonpaged pool. Is this >>> dependent on physical memory? >>> >>> Actually, I have the option of using single 1MB pool both for writes >>> and reads. I would like to know if the system be degraded (in terms of >>> performance or anything else) if I use two pool memories instead of >>> one pool memory? >>> >>> Thanks and Regards, >>> Kid >> >>
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