From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965521AbXDVIIT (ORCPT ); Sun, 22 Apr 2007 04:08:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965485AbXDVIIT (ORCPT ); Sun, 22 Apr 2007 04:08:19 -0400 Received: from 1wt.eu ([62.212.114.60]:2165 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965521AbXDVIIR (ORCPT ); Sun, 22 Apr 2007 04:08:17 -0400 Date: Sun, 22 Apr 2007 10:06:07 +0200 From: Willy Tarreau To: Con Kolivas Cc: linux kernel mailing list , ck list , Ingo Molnar , Mike Galbraith , Al Boldi , Peter Williams , Nick Piggin , Matt Mackall , Bill Huey , William Lee Irwin III , Gene Heskett Subject: Re: [ANNOUNCE] Staircase Deadline cpu scheduler version 0.45 Message-ID: <20070422080607.GA15411@1wt.eu> References: <200704221441.48897.kernel@kolivas.org> <20070422070037.GA15092@1wt.eu> <200704221727.44430.kernel@kolivas.org> <200704221731.58724.kernel@kolivas.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200704221731.58724.kernel@kolivas.org> User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Apr 22, 2007 at 05:31:58PM +1000, Con Kolivas wrote: > On Sunday 22 April 2007 17:27, Con Kolivas wrote: > > On Sunday 22 April 2007 17:00, Willy Tarreau wrote: > > > On Sun, Apr 22, 2007 at 02:41:48PM +1000, Con Kolivas wrote: > > > > A significant bugfix for SMP balancing was just posted for the > > > > staircase deadline cpu scheduler which improves behaviour dramatically > > > > on any SMP machine. > > > > > > > > Thanks to Willy Tarreau for noticing likely fault point. > > > > > > > > Also requested was a version in the Makefile so this version of the > > > > patch adds -sd045 to the kernel version. > > > > > > Con, I'm sorry, but it is worse with this one :-( > > > > Well that was quick testing, thanks. > > > > > The lag when typing in xterms is even more noticeable and vmstat output > > > oscillates between 8 and 65, with idle rates around 50%, as you can see > > > below : > > > > > > Renicing X or not does not change anything here. > > > > > > I suspect that the bug you fixed was hiding another one :-/ > > > If you want me to test another patch, feel free to ask. > > Just as a debug point could you please try this patch? Thanks. OK, this time, the ocbench took ages to start. They appeared immediately but very few of them (less than 8 out of 64) really started to work. The system remained very responsive and smooth during the test. But I guess I know why : all the load was sent to CPU 0 : procs memory swap io system cpu r b w swpd free buff cache si so bi bo in cs us sy id 63 0 0 0 923476 6516 57456 0 0 0 28 175 1281 14 26 59 64 0 2 0 922976 6516 57456 0 0 0 0 4 261 19 31 50 64 0 0 0 922924 6516 57492 0 0 0 0 1 85 17 33 50 64 0 0 0 922924 6516 57492 0 0 0 0 0 110 25 25 50 64 0 1 0 922924 6516 57492 0 0 0 0 3 83 24 27 50 64 0 0 0 922924 6516 57492 0 0 0 4 16 267 18 33 50 64 0 0 0 922924 6516 57492 0 0 0 0 15 244 24 27 50 64 0 0 0 922956 6516 57492 0 0 0 0 8 200 20 31 49 59 0 0 0 922956 6516 57492 0 0 0 0 1 98 18 34 49 59 0 0 0 922956 6516 57492 0 0 0 0 0 105 21 30 49 64 0 0 0 922956 6516 57492 0 0 0 0 1 97 19 32 49 62 0 0 0 922972 6516 57492 0 0 0 0 0 114 23 28 49 64 0 0 0 922972 6516 57492 0 0 0 0 1 95 23 28 49 64 0 0 0 922972 6516 57492 0 0 0 0 0 104 22 29 49 CPU0 states: 45.0% user 54.0% system 0.0% nice 0.0% iowait 0.0% idle CPU1 states: 0.1% user 0.0% system 0.0% nice 0.0% iowait 99.0% idle Mem: 1034876k av, 112296k used, 922580k free, 0k shrd, 6524k buff 34232k active, 45428k inactive Swap: 497972k av, 0k used, 497972k free 57536k cached PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND 1402 willy 31 0 2272 640 548 R 2.9 0.0 0:00 0 ocbench 1407 willy 31 0 2272 640 548 R 2.9 0.0 0:00 0 ocbench 1452 willy 31 0 2272 640 548 R 2.9 0.0 0:00 0 ocbench 1455 willy 31 0 2272 640 548 R 2.9 0.0 0:00 0 ocbench 1394 willy 29 0 2272 640 548 R 1.9 0.0 0:00 0 ocbench 1395 willy 29 0 2272 640 548 R 1.9 0.0 0:00 0 ocbench 1396 willy 31 0 2272 640 548 R 1.9 0.0 0:00 0 ocbench 1400 willy 31 0 2272 640 548 R 1.9 0.0 0:00 0 ocbench 1401 willy 29 0 2272 640 548 R 1.9 0.0 0:00 0 ocbench 1404 willy 31 0 2272 640 548 R 1.9 0.0 0:00 0 ocbench 1408 willy 31 0 2272 640 548 R 1.9 0.0 0:00 0 ocbench 1409 willy 31 0 2272 640 548 R 1.9 0.0 0:00 0 ocbench 1411 willy 31 0 2272 640 548 R 1.9 0.0 0:00 0 ocbench 1412 willy 31 0 2272 640 548 R 1.9 0.0 0:00 0 ocbench 1413 willy 31 0 2272 640 548 R 1.9 0.0 0:00 0 ocbench Willy