From mboxrd@z Thu Jan 1 00:00:00 1970 From: bert hubert Subject: Re: [Question] SMP for Linux Date: Thu, 17 Oct 2002 12:02:43 +0200 Sender: netdev-bounce@oss.sgi.com Message-ID: <20021017100243.GA6569@outpost.ds9a.nl> References: <20021017112928.B20854@toad.postech.ac.kr> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: niv@us.ibm.com, netdev@oss.sgi.com Return-path: To: Hyochang Nam Content-Disposition: inline In-Reply-To: <20021017112928.B20854@toad.postech.ac.kr> Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org 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