From: bert hubert <ahu@ds9a.nl>
To: Hyochang Nam <cannon@postech.ac.kr>
Cc: niv@us.ibm.com, netdev@oss.sgi.com
Subject: Re: [Question] SMP for Linux
Date: Thu, 17 Oct 2002 12:02:43 +0200 [thread overview]
Message-ID: <20021017100243.GA6569@outpost.ds9a.nl> (raw)
In-Reply-To: <20021017112928.B20854@toad.postech.ac.kr>
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
--
http://www.PowerDNS.com Versatile DNS Software & Services
http://www.tk the dot in .tk
http://lartc.org Linux Advanced Routing & Traffic Control HOWTO
next prev parent reply other threads:[~2002-10-17 10:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-17 2:29 [Question] SMP for Linux Hyochang Nam
2002-10-17 10:02 ` bert hubert [this message]
2002-10-17 12:00 ` Robert Olsson
2002-10-17 17:28 ` Jon Fraser
2002-10-18 16:16 ` Robert Olsson
2002-10-18 23:29 ` Jon Fraser
2002-10-19 0:20 ` Nivedita Singhvi
2002-10-19 7:53 ` Robert Olsson
2002-10-24 21:00 ` Jon Fraser
2002-11-13 6:53 ` Eric Lemoine
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