netdev - Re: [PATCH v5] rfs: Receive Flow Steering

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Message-ID: <1271777962.7895.25.camel@edumazet-laptop>
Date:	Tue, 20 Apr 2010 17:39:22 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	Changli Gao <xiaosuo@...il.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v5] rfs: Receive Flow Steering

Le mardi 20 avril 2010 à 08:04 -0700, Tom Herbert a écrit :

> Maybe for the purposes of RPS, but hash collisions could definitely be
> an issue in RFS.  If two active connections hit the same rps_flow
> entry this may cause thrashing of those connections between CPUs.  I
> think your patch may increase the probability of this happening.
> 

Good point.

I'll make a gathering of tcp tuples on a busy server over a day and try
to compute number of clashes we can get with and without the addr/port
swapping.


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