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SubjectRe: 2.6.8.1 mempool subsystem sickness
jmerkey@comcast.net wrote:
> On a system with 4GB of memory, and without
> the user space patch that spilts user space
> just a stock kernel, I am seeing memory
> allocation failures with X server and simple
> apps on a machine with a Pentium 4
> processor and 500MB of memory.
>
> If you load large apps and do a lot of
> skb traffic, the mempool abd slab
> caches start gobbling up pages
> and don't seem to balance them
> very well, resulting in memory
> allocation failures over time if
> the system stays up for a week
> or more.
>
> I am also seeing the same behavior
> on another system which has been
> running for almost 30 days with
> an skb based traffic regeneration
> test calling and sending skb's
> in kernel between two interfaces.
>
> The pages over time get stuck
> in the slab allocator and user
> space apps start to fail on alloc
> requests.
>
> Rebooting the system clears
> the problem, which slowly over time
> comes back. I am seeing this with
> stock kernels from kernel.org
> and on kernels I have patched,
> so the problem seems to be
> in the base code. I have spent
> the last two weeks observing
> the problem to verify I can
> reproduce it and it keeps
> happening.
>
> Jeff
>

Hi Jeff,
Can you give us a few more details please? Post the allocation failure
messages in full, and post /proc/meminfo, etc. Thanks.
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