linux-kernel - Re: problems with e1000 and jumboframes

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Message-ID: <Pine.LNX.4.64.0608031646110.8443@bizon.gios.gov.pl>
Date:	Thu, 3 Aug 2006 16:49:15 +0200 (CEST)
From:	Krzysztof Oledzki <olel@....pl>
To:	Benjamin LaHaise <bcrl@...ck.org>
cc:	Arnd Hannemann <arnd@...dnet.de>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: problems with e1000 and jumboframes



On Thu, 3 Aug 2006, Benjamin LaHaise wrote:

> On Thu, Aug 03, 2006 at 03:48:39PM +0200, Arnd Hannemann wrote:
>> However the box is a VIA Epia MII12000 with 1 GB of Ram and 1 GB of swap
>> enabled, so there should be plenty of memory available. HIGHMEM support
>> is off. The e1000 nic seems to be an 82540EM, which to my knowledge
>> should support jumboframes.
>
>> However I can't always reproduce this on a freshly booted system, so
>> someone else may be the culprit and leaking pages?
>>
>> Any ideas how to debug this?
>
> This is memory fragmentation, and all you can do is work around it until
> the e1000 driver is changed to split jumbo frames up on rx.  Here are a
> few ideas that should improve things for you:
>
> 	- switch to a 2GB/2GB split to recover the memory lost to highmem
> 	  (see Processor Type and Features / Memory split)
With 1 GB of RAM full 1GB/3GB (CONFIG_VMSPLIT_3G_OPT) seems to be 
enough...

> 	- increase /proc/sys/vm/min_free_kbytes -- more free memory will
> 	  improve the odds that enough unfragmented memory is available for
> 	  incoming network packets

True. IMO, 65535 is a good starting point.

Best regards,
 				Krzysztof Olędzki