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Message-ID: <u2t65634d661004161342zeadb5602w73c369ec717dc6e1@mail.gmail.com>
Date: Fri, 16 Apr 2010 13:42:57 -0700
From: Tom Herbert <therbert@...gle.com>
To: Eric Dumazet <eric.dumazet@...il.com>
Cc: David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v5] rfs: Receive Flow Steering
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!
>> I am not particularly surprised by the results, using loopback
>> interface already provides good parallelism and RPS/RFS really would
>> only add overhead and more trips between CPUs (last part is why RPS <
>> RFS I suspect)-- I guess this is why we've never enabled RPS on
>> loopback :-)
>>
>> Eric, do you have a particular concern that this could affect a real workload?
>>
>
> I was expecting RFS to be better than RPS at least, for this particular
> workload (tcp over loopback)
>
This was my expectation too, and what my "corrected" numbers show :-)
But, I take it this is different in your results?
Tom
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