netdev - Re: iproute uses too small of a receive buffer

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Date:	Wed, 28 Oct 2009 20:05:12 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Stephen Hemminger <shemminger@...tta.com>,
	Ben Greear <greearb@...delatech.com>,
	NetDev <netdev@...r.kernel.org>
Subject: Re: iproute uses too small of a receive buffer

Eric Dumazet wrote:
> Stephen Hemminger a écrit :
>> Just having larger buffer isn't guarantee of success. Allocating
>> a huge buffer is not going to work on embedded.
>>
> 
> Please note we do not allocate a big buffer, only allow more small skbs
> to be queued on socket receive queue.
> 
> If memory is not available, skb allocation will eventually fail
> and be reported as well, embedded or not.
> 
> I vote for allowing 1024*1024 bytes instead of 32768,
> and eventually user should be warned that it is capped by 
> /proc/sys/net/core/rmem_max

How about this? It will double the receive queue limit on ENOBUFS
up to 1024 * 1024b, then bail out with the normal error message on
further ENOBUFS.

Signed-off-by: Patrick McHardy <kaber@...sh.net>

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