From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 11 Nov 2002 19:02:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 11 Nov 2002 19:02:52 -0500 Received: from packet.digeo.com ([12.110.80.53]:17138 "EHLO packet.digeo.com") by vger.kernel.org with ESMTP id ; Mon, 11 Nov 2002 19:02:52 -0500 Message-ID: <3DD046BD.799F36D4@digeo.com> Date: Mon, 11 Nov 2002 16:09:33 -0800 From: Andrew Morton X-Mailer: Mozilla 4.79 [en] (X11; U; Linux 2.5.46 i686) X-Accept-Language: en MIME-Version: 1.0 To: Con Kolivas CC: linux kernel mailing list Subject: Re: [BENCHMARK] 2.5.47{-mm1} with contest References: <1037057498.3dd03dda5a8b9@kolivas.net> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 12 Nov 2002 00:09:34.0295 (UTC) FILETIME=[C7D23670:01C289DF] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Con Kolivas wrote: > > io_load: > Kernel [runs] Time CPU% Loads LCPU% Ratio > 2.4.18 [3] 474.1 15 36 10 6.64 > 2.4.19 [3] 492.6 14 38 10 6.90 > 2.5.46 [1] 600.5 13 48 12 8.41 > 2.5.46-mm1 [5] 134.3 58 6 8 1.88 > 2.5.47 [3] 165.9 46 9 9 2.32 > 2.5.47-mm1 [5] 126.3 61 5 8 1.77 > > Very nice. Further improvement in 2.5.47-mm1 (note the big change in 2.5.46-47 > is consistent with the preempt addition as mentioned in a previous thread) > Actually, 2.5.47 changed fifo_batch from 32 to 16. That's what caused this big shift. We've increased the kernel build speed by 3.6x while decreasing the speed at which writes are retired by 5.3x. It could be argued that this is a net decrease in throughput. Although there's clearly a big increase in total CPU utilisation. It's a tradeoff. I think this is a better tradeoff than the old one though.