From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263243AbTDWJA0 (ORCPT ); Wed, 23 Apr 2003 05:00:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263264AbTDWJA0 (ORCPT ); Wed, 23 Apr 2003 05:00:26 -0400 Received: from nat-pool-rdu.redhat.com ([66.187.233.200]:53991 "EHLO devserv.devel.redhat.com") by vger.kernel.org with ESMTP id S263243AbTDWJAZ (ORCPT ); Wed, 23 Apr 2003 05:00:25 -0400 Date: Wed, 23 Apr 2003 05:12:29 -0400 (EDT) From: Ingo Molnar X-X-Sender: mingo@devserv.devel.redhat.com To: "Martin J. Bligh" cc: linux-kernel@vger.kernel.org Subject: Re: [patch] HT scheduler, sched-2.5.68-A9 In-Reply-To: <1490710000.1051055323@flay> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 22 Apr 2003, Martin J. Bligh wrote: > Hmmm. When the machine is loaded up fully, this seems OK, but for lower > loads, it seems to have a significant degredation. This is on my normal > 16-way machine, no HT at all ... just checking for degredations. At a > guess, maybe it's bouncing stuff around between runqueues under low > loads? hm - it should not cause any change in the non-HT case. Oh, there's one thing that could make a difference on SMP - could you change AGRESSIVE_IDLE_STEAL back to 0? > Are there things embedded in here that change stuff for non-HT machines? not intentionally, but apparently there's some sort of effect. The idle steal thing could explain it. Ingo