linux-kernel - Re: Problem: Out of memory after 2days with 2GB RAM

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Date:	Thu, 12 Jun 2008 16:12:18 +0200
From:	"Zdenek Kabelac" <zdenek.kabelac@...il.com>
To:	"Johannes Berg" <johannes@...solutions.net>
Cc:	"Rik van Riel" <riel@...hat.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	yi.zhu@...el.com, reinette.chatre@...el.com,
	linux-wireless@...r.kernel.org
Subject: Re: Problem: Out of memory after 2days with 2GB RAM

2008/6/12 Johannes Berg <johannes@...solutions.net>:
> On Thu, 2008-06-12 at 09:38 -0400, Rik van Riel wrote:
>> On Thu, 12 Jun 2008 12:07:34 +0200
>> "Zdenek Kabelac" <zdenek.kabelac@...il.com> wrote:
>>
>> > It looks like while there was a huge amount of buffers and caches -
>> > system was unable to allocate few pages for kmalloc in iwl3945 driver
>> > after resume.
>>
>> It looks like this is because it wants to allocate 2**5 contiguous
>> pages, which is 128kB of contiguous kernel memory.
>
> 64-bit system I assume?
> The allocation should be 256 * 20 * sizeof(struct sk_buff *).
>
> Try the patch below. It should improve code generation too.

I'll surely try you patch - but is the iwl the only driver which needs
128kB continuous memory chunk?

I think that if the 128kB memchunks are exhausted in 2 days while
there is over 1GB of free RAM in buffers & caches I think some
defragmentation is needed then ?

btw: Does it really means that within those buffers kernel could not
find any adjacent 32 pages which could be made free ?

Zdenek
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