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Re: [Question] SMP for Linux

To: Hyochang Nam <cannon@xxxxxxxxxxxxx>
Subject: Re: [Question] SMP for Linux
From: bert hubert <ahu@xxxxxxx>
Date: Thu, 17 Oct 2002 12:02:43 +0200
Cc: niv@xxxxxxxxxx, netdev@xxxxxxxxxxx
In-reply-to: <20021017112928.B20854@toad.postech.ac.kr>
Mail-followup-to: bert hubert <ahu@xxxxxxx>, Hyochang Nam <cannon@xxxxxxxxxxxxx>, niv@xxxxxxxxxx, netdev@xxxxxxxxxxx
References: <20021017112928.B20854@toad.postech.ac.kr>
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On Thu, Oct 17, 2002 at 11:29:28AM +0900, Hyochang Nam wrote:
> Many people helped me to solve the interrupt distribution problem.
> We tested the throughput of Layer 3 forwarding on a SMP machine
> which equips two Zero proessor(2Ghz). This is our results:
>   -------------------------
>        SMP    |  No SMP
>   -------------------------
>     230 Mbps  | 330 Mbps
>   -------------------------

There is something called 'irq affinity' which may be interesting for you.
See here: http://www.dell.com/us/en/esg/topics/power_ps1q02-morse.htm

/proc/irq/?/smp_affinity

> I expected that the SMP might show better throughput than "NO SMP"
> environments. But, contrary to my expectation, SMP showed poor results. 
> I don't know what is my fault in the experiments.

SMP is not always a win.

Regards,

bert hubert

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