From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754690Ab1ABRTt (ORCPT ); Sun, 2 Jan 2011 12:19:49 -0500 Received: from mx1.redhat.com ([209.132.183.28]:11606 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752511Ab1ABRTs (ORCPT ); Sun, 2 Jan 2011 12:19:48 -0500 Message-ID: <4D20B38B.40007@redhat.com> Date: Sun, 02 Jan 2011 12:19:07 -0500 From: Rik van Riel User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101209 Fedora/3.1.7-0.35.b3pre.fc13 Lightning/1.0b3pre Thunderbird/3.1.7 MIME-Version: 1.0 To: Hillf Danton CC: Marcelo Tosatti , Peter Zijlstra , Srivatsa Vaddagiri , linux-kernel@vger.kernel.org, Avi Kivity , Edwin Zhai Subject: Re: [RFC PATCH 2/3] sched: add yield_to function References: In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/02/2011 06:43 AM, Hillf Danton wrote: > The following work is based on what Rik posted, with a few changes. I threw out my patch before Christmas, replacing it with Mike Galbraith's work. Today I finally discovered why I had not been getting very useful results testing the PLE code on the test system. On this particular CPU model (Intel(R) Xeon(R) CPU X5670), the value of ple_gap needs to be at least 48 ! A ple_gap value of 41 is simply too low to trigger reliably with Avi's kvm-unit-tests PLE test and also only triggers a few times a second at most (not too useful) with the other tests I had been running... -- All rights reversed