linux-kernel - Re: big picture UDP/IP performance question re 2.6.18 -> 2.6.32

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Message-ID: <87zkhg1ppl.fsf@depni.sinp.msu.ru>
Date:	Wed, 05 Oct 2011 00:12:06 +0400
From:	Serge Belyshev <belyshev@...ni.sinp.msu.ru>
To:	Christoph Lameter <cl@...two.org>
Cc:	Joe Perches <joe@...ches.com>, starlight@...nacle.cx,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	Willy Tarreau <w@....eu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephen Hemminger <stephen.hemminger@...tta.com>
Subject: Re: big picture UDP/IP performance question re 2.6.18  -> 2.6.32


BFS FAQ writes:

> NUMA aware?
>
> It is NOT NUMA aware in the sense that it does any fancy shit on NUMA, but
> it will work on NUMA hardware just fine. Only the really big NUMA hardware
> is likely to suffer in performance, and this is theoretically only, since
> no one has that sort of hardware to prove it to me, but it seems almost
> certain. 
This part of FAQ entry was written before 0.300, (i.e. more than 2 years ago)


> v0.300 onwards have NUMA enhancements.
And this was added after. =)

As of now, BFS scheduling is NUMA-aware. (see resched_best_mask())
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