netdev - Re: Testing server performance

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Date:	Mon, 12 Dec 2011 10:36:52 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	igorm@....rs
Cc:	netdev@...r.kernel.org
Subject: Re: Testing server performance

Le vendredi 09 décembre 2011 à 16:26 +0100, Igor Maravić a écrit :
> Hi all,
> I'm currently testing how much traffic can I push through my server.
> I'm running on Ubuntu 11.10 server with net-next kernel.
> I'm using 2 Gbps NICs, Netgear GA311 and D-Link DGE-528T, that use r8169 driver.
> I'm generating UDP packets from a router with constant speed.
> 
> After I push traffic to my server with max speed, it saturates.
> It receives packets at 77MBps and it sends packet with 14MBps.
> When there are no incoming traffic, but there are remaining packets in
> tx fifo queue, it sends them with 40MBps.
> 
> That all wouldn't be strange because my machine isn't any thing special
> (AMD Athlon(tm) II X2 240 on 2,8GHz, motherboard ASUS M2N68 PLUS and
> 2x2GB DDR2 RAM memory on 1066MHz),
> but the dstat shows that CPUs are maximally using 6% of their
> resources for interrupt handling.
> Beside that, nothing else is using CPU time.
> Why does it saturate on this values then? Am I doing something wrong?
> Any help is appreciated.
> 
> BR
> Igor
> 
> PS. Kernel is SMP enabled and I tried different bit masks for
> smp_affinity for my interfaces, but I still got the same result.

I have doubts you get such poor performance from your machine.

77Mbps, thats how many packets per second ???


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