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

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Message-ID: <1271453133.16881.4505.camel@edumazet-laptop>
Date:	Fri, 16 Apr 2010 23:25:33 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v5] rfs: Receive Flow Steering

Le vendredi 16 avril 2010 à 23:12 +0200, Eric Dumazet a écrit :
> Le vendredi 16 avril 2010 à 13:42 -0700, Tom Herbert a écrit :
> > On Fri, Apr 16, 2010 at 11:53 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > > Le vendredi 16 avril 2010 à 11:35 -0700, Tom Herbert a écrit :
> > >> Results with "tbench 16" on an 8 core Intel machine.
> > >>
> > >> No RPS/RFS:  2155 MB/sec
> > >> RPS (0ff mask): 1700 MB/sec
> > >> RFS: 1097
> > >>
> > 
> > Blah, I mistakingly reported that... should have been:
> > 
> > No RPS/RFS:  2155 MB/sec
> > RPS (0ff mask): 1097 MB/sec
> > RFS: 1700 MB/sec
> > 
> > Sorry about that!
> 
> > This was my expectation too, and what my "corrected" numbers show :-)
> > But, I take it this is different in your results?
> 
> 
> My results are on a "tbench 16" on an dual X5570  @ 2.93GHz.
> (16 logical cpus)
> 
> No RPS , no RFS : 4448.14 MB/sec 
> RPS : 2298.00 MB/sec (but lot of variation)
> RFS : 2600 MB/sec
> 
> Maybe my RFS setup is bad ?
> (8192 flows)
> 

Very strange, a second tbench-16 RFS=y run gave me 2134.08 MB/sec 

A third run gave me 1813.21 MB/sec 
A fourth run gave me 2472.91 MB/sec 

Hmm...




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