Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757194AbYLPAt6 (ORCPT ); Mon, 15 Dec 2008 19:49:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755256AbYLPAtt (ORCPT ); Mon, 15 Dec 2008 19:49:49 -0500 Received: from fxip-0047f.externet.hu ([88.209.222.127]:38378 "EHLO pomaz-ex.szeredi.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754185AbYLPAts (ORCPT ); Mon, 15 Dec 2008 19:49:48 -0500 To: rjw@sisk.pl CC: a.p.zijlstra@chello.nl, efault@gmx.de, mingo@elte.hu, linux-kernel@vger.kernel.org, kernel-testers@vger.kernel.org, miklos@szeredi.hu In-reply-to: (rjw@sisk.pl) Subject: Re: [Bug #12208] uml is very slow on 2.6.28 host References: Message-Id: From: Miklos Szeredi Date: Tue, 16 Dec 2008 01:49:41 +0100 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1245 Lines: 30 On Sat, 13 Dec 2008, Rafael J. Wysocki wrote: > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=12208 > Subject : uml is very slow on 2.6.28 host > Submitter : Miklos Szeredi > Date : 2008-12-12 9:35 (2 days old) > References : http://marc.info/?l=linux-kernel&m=122907463518593&w=4 I did a bisection, and this is the commit which is responsible: commit 464b75273f64be7c81fee975bd6ca9593df3427b Author: Peter Zijlstra Date: Fri Oct 24 11:06:15 2008 +0200 sched: re-instate vruntime based wakeup preemption The advantage is that vruntime based wakeup preemption has a better conceptual model. Here wakeup_gran = 0 means: preempt when 'fair'. Therefore wakeup_gran is the granularity of unfairness we allow in order to make progress. Signed-off-by: Peter Zijlstra Acked-by: Mike Galbraith Signed-off-by: Ingo Molnar Miklos -- 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/