Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 8 Jul 2002 21:23:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 8 Jul 2002 21:22:59 -0400 Received: from jalon.able.es ([212.97.163.2]:60319 "EHLO jalon.able.es") by vger.kernel.org with ESMTP id ; Mon, 8 Jul 2002 21:22:58 -0400 Date: Tue, 9 Jul 2002 03:25:34 +0200 From: "J.A. Magallon" To: rwhron@earthlink.net Cc: andrea@suse.de, jamagallon@able.es, linux-kernel@vger.kernel.org, lse-tech@lists.sourceforge.net Subject: Re: pipe and af/unix latency differences between aa and jam on smp Message-ID: <20020709012534.GE1835@werewolf.able.es> References: <20020709005901.GA9616@rushmore> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Disposition: inline Content-Transfer-Encoding: 7BIT In-Reply-To: <20020709005901.GA9616@rushmore>; from rwhron@earthlink.net on Tue, Jul 09, 2002 at 02:59:01 +0200 X-Mailer: Balsa 1.3.6 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2085 Lines: 43 On 2002.07.09 rwhron@earthlink.net wrote: >The -jam patchset is interesting because it starts out >with the entire -aa patchset and adds a few things. > >Sometimes small differences in LMbench between -jam and -aa are >just CPU bounces on SMP. The difference for pipe and af/unix latency >only appears on SMP too, but it is very consistent. (My k6/2 >has small differences between -aa and -jam for pipe and af/unix >latency). > >You will know better what could make the difference: > >This is the averages: > >*Local* Communication latencies in microseconds - smaller is better >------------------------------------------------------------------- >kernel Pipe AF/Unix >----------------- ------- ------- >2.4.19-pre10-aa4 33.941 70.216 >2.4.19-pre10-jam2 7.877 16.699 > I took a look at your numbers: *Local* Communication latencies in microseconds - smaller is better ------------------------------------------------------------------- kernel Pipe AF/Unix UDP RPC/UDP TCP RPC/TCP TCPconn ----------------------------- ------- ------- ------- ------- ------- ------- ------- 2.4.19-pre7-jam6 29.513 42.369 58.6165 60.7792 50.2572 82.4976 87.321 2.4.19-pre8-jam2 7.697 15.274 59.6730 60.8190 55.276 82.1297 89.416 2.4.19-pre8-jam2-nowuos 7.739 14.929 57.9326 60.5497 55.9745 81.8908 90.370 (last line says that wake-up-sync is not responsible...) Main changes between first two were irqbalance and ide6->ide10. -- J.A. Magallon \ Software is like sex: It's better when it's free mailto:jamagallon@able.es \ -- Linus Torvalds, FSF T-shirt Linux werewolf 2.4.19-rc1-jam2, Mandrake Linux 8.3 (Cooker) for i586 gcc (GCC) 3.1.1 (Mandrake Linux 8.3 3.1.1-0.7mdk) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/