netdev - Re: debugging kernel during packet drops

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Message-ID: <4BAB3C8B.3030104@trash.net>
Date:	Thu, 25 Mar 2010 11:35:55 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Jorrit Kronjee <j.kronjee@...opact.nl>,
	netfilter-devel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: debugging kernel during packet drops

Eric Dumazet wrote:
> Here is patch I cooked for xt_hashlimit (on top of net-next-2.6) to make
> it use RCU and scale better in your case (allowing several concurrent
> cpus once RPS is activated), but also on more general cases.
> 
> [PATCH] xt_hashlimit: RCU conversion
> 
> xt_hashlimit uses a central lock per hash table and suffers from
> contention on some workloads.
> 
> After RCU conversion, central lock is only used when a writer wants to
> add or delete an entry. For 'readers', updating an existing entry, they
> use an individual lock per entry.

This clashes with some recent cleanups in nf-next-2.6.git. I'm
also expecting a patch from Jan to remove the old v0 revision
very soon (probably today). Please rediff once I've pushed that out.
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