From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 16 Nov 2001 03:26:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 16 Nov 2001 03:26:06 -0500 Received: from vasquez.zip.com.au ([203.12.97.41]:63760 "EHLO vasquez.zip.com.au") by vger.kernel.org with ESMTP id ; Fri, 16 Nov 2001 03:25:53 -0500 Message-ID: <3BF4CD71.DD691BCC@zip.com.au> Date: Fri, 16 Nov 2001 00:25:21 -0800 From: Andrew Morton X-Mailer: Mozilla 4.77 [en] (X11; U; Linux 2.4.14-pre8 i686) X-Accept-Language: en MIME-Version: 1.0 To: lkml Subject: low-latency patch for 2.4.15-pre5 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org A low-latency scheduling patch for 2.4.15-pre4/pre5 is at http://www.zip.com.au/~akpm/linux/schedlat.html#downloads This is a general retune, retest and review. A couple of bugs which have crept into the patch were fixed. ext3 support is added. Certain code paths which were introduced into the kernel in the 2.4.9-2.4.11 timeframe have been addressed. On a single 850MHz PIII with 768 megs of RAM and 1G of swap the worst case interrupt-to-activation scheduling latency is around 400 microseconds. Latencies on SMP are up to 1000 microseconds. These measurements are across extreme workloads - peak latency across an SMP kernel build is 260 microseconds. -