From owner-freebsd-hackers Wed Mar 28 21:56:43 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from max5.rrze.uni-erlangen.de (max5.rrze.uni-erlangen.de [131.188.3.50]) by hub.freebsd.org (Postfix) with ESMTP id 8197337B719 for ; Wed, 28 Mar 2001 21:56:40 -0800 (PST) (envelope-from Jochen.Kaiser@rrze.uni-erlangen.de) Received: from devil.rrze.uni-erlangen.de by max5.rrze.uni-erlangen.de with ESMTP for freebsd-hackers@freebsd.org; Thu, 29 Mar 2001 07:56:39 +0200 Received: (from unrza2@localhost) by devil.rrze.uni-erlangen.de (8.9.3/8.9.3) id HAA19345 for freebsd-hackers@freebsd.org; Thu, 29 Mar 2001 07:52:38 +0200 (CEST) From: Jochen Kaiser Date: Thu, 29 Mar 2001 07:52:37 +0200 To: freebsd-hackers@FreeBSD.ORG Subject: Network Throughput;SMP Message-Id: <20010329075237.A25652@devil.rrze.uni-erlangen.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0.1i Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Hello, I am doing some tests with a traffic generator atm. It's a SmartBits 6000 and I tried to test my FreeBSD box. I did a test series which did start at low bandwidth (5MBit) and until 85Mbit all seemed ok. But then I tried to find the frontiers - and I did. Test: 93MBit Constant Stream, UDP, PktSize:491 Bytes Results: 1 Proc: shows clean linear growth of the delay time over the Pckt# 2 Proc: the line shows increased growth at the beginning which than grows (SMP) in parallel to the other line. (so it shows higher delays) This astonished me. But netstat -w1 shows the same: 1 Proc shows: [...] 27083 0 11793296 27079 0 11793296 0 27072 0 11793296 27048 0 11793296 0 27083 0 11795052 27085 0 11793576 0 SMP shows: [...] 26299 7 11435222 26462 0 9824525 10 26226 8 11441218 3788 0 9999985 15 26312 7 11453406 47716 0 9998115 0 It seems that SMP has some performance losses compared to single proc. I think this behaviour is already well known. Is there an explanation for it (maybe SMP overhead, APIC routes IRQ wrong)? Is there an Analysis? Used Hardware, Tyan Board Dual PIII 800MHz, BX440, 512MB, 2 fxp, 1xl Thanks for your time & cheers, Jochen p.s: don't stone when this belongs to the smp list, please, just reroute me :) -- Jochen Kaiser kind@IRCNET, phone +49 9131 85-28134 Network Administration mailto:jochen.kaiser@rrze.uni-erlangen.de Regionales Rechenzentrum Universitaet Erlangen-Nuernberg, Germany GPG public key: http://www.uni-erlangen.de/~unrza2/public_key.txt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message