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

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Message-Id: <20100419.130905.210660275.davem@davemloft.net>
Date:	Mon, 19 Apr 2010 13:09:05 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	therbert@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH v5] rfs: Receive Flow Steering

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sat, 17 Apr 2010 18:10:33 +0200

> Le vendredi 16 avril 2010 à 23:12 +0200, Eric Dumazet a écrit :
>> 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)
>> 
> 
> With attached patch, I reached 
> 
> Throughput 4465.13 MB/sec 16 procs
> 
> RFS better than no RPS/RFS :)
> 
> So, the old idea to make rxhash consistent (same value in both
> directions) is a win for some workloads (Consider connection tracking /
> firewalling) 

Fun :-)  I toyed around with this on my 128 cpu machine (2 NUMA
nodes, 64 cpus each NUMA node).

Vanilla net-next-2.6, no configuration changes:

tbench 64: Throughput 1843.43 MB/sec 64 procs
tbench 128: Throughput 1889.67 MB/sec 128 procs

Vanilla net-next-2.6, rps_cpus="ffffffff,ffffffff,ffffffff,ffffffff"

tbench 64: Throughput 1455.89 MB/sec 64 procs
tbench 128: Throughput 2009.91 MB/sec 128 procs

net-next-2.6 + Eric's port hashing patch, rps_cpus="ffffffff,ffffffff,ffffffff,ffffffff"

tbench 64: Throughput 1593.13 MB/sec 64 procs
tbench 128: Throughput 2367.27 MB/sec 128 procs

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