netdev - Re: debugging kernel during packet drops

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Date:	Tue, 30 Mar 2010 14:06:37 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Patrick McHardy <kaber@...sh.net>
cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Jorrit Kronjee <j.kronjee@...opact.nl>,
	netfilter-devel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: debugging kernel during packet drops

On Thursday 2010-03-25 11:35, Patrick McHardy wrote:

>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.

One 12-series request has been sitting there for a while. Was there 
something not in order with it?

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