netdev - Re: [PATCH 00/16] Remove the ipv4 routing cache

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Date:	Thu, 26 Jul 2012 19:02:37 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Paweł Staszewski <pstaszewski@...are.pl>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 00/16] Remove the ipv4 routing cache

On Mon, 2012-07-23 at 19:54 +0200, Paweł Staszewski wrote:

> I make some real life tests with 10Gbit traffic and make some rdos.
> With kernel 3.4.5 when I reach 6M routing cache entries - traffic is not 
> forwarded - on my hardware with 64G RAM
> 
> With kernel - 3.5.0-rc7-next-20120720 + David M. patches - route cache 
> removal + fix
> Traffic is forwarder all the time at speed 8.2Mpps RX from traffic 
> generator and 8.2Mpps TX to the sink
> 
> Also I see performance improvement.
> 
> With kernel 3.4.5 I can reach maximum od 7.5Mpps with my hardware
> And with kernel 3.5.0-rc7-next-20120720 i can reach 8.2Mpps - forwarding 
> UDP performance - can be more - but my TX pktgen that use 6 cores can't 
> do more.
> 
> Really thanks for this :)

In real life, with TCP traffic, make sure you
set /proc/sys/net/ipv4/ip_early_demux to 0 



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