Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754537AbZALRQV (ORCPT ); Mon, 12 Jan 2009 12:16:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750918AbZALRQI (ORCPT ); Mon, 12 Jan 2009 12:16:08 -0500 Received: from rcsinet13.oracle.com ([148.87.113.125]:43412 "EHLO rgminet13.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750779AbZALRQG (ORCPT ); Mon, 12 Jan 2009 12:16:06 -0500 Subject: Re: [PATCH -v8][RFC] mutex: implement adaptive spinning From: Chris Mason To: Peter Zijlstra Cc: Linus Torvalds , Ingo Molnar , "Paul E. McKenney" , Gregory Haskins , Matthew Wilcox , Andi Kleen , Andrew Morton , Linux Kernel Mailing List , linux-fsdevel , linux-btrfs , Thomas Gleixner , Nick Piggin , Peter Morreale , Sven Dietrich , Dmitry Adamushko In-Reply-To: <1231779015.4371.138.camel@laptop> References: <1231774622.4371.96.camel@laptop> <1231778757.22806.24.camel@think.oraclecorp.com> <1231779015.4371.138.camel@laptop> Content-Type: text/plain Date: Mon, 12 Jan 2009 12:14:51 -0500 Message-Id: <1231780491.22806.28.camel@think.oraclecorp.com> Mime-Version: 1.0 X-Mailer: Evolution 2.24.1 Content-Transfer-Encoding: 7bit X-Source-IP: acsmt703.oracle.com [141.146.40.81] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090201.496B7A90.00F2:SCFSTAT928724,ss=1,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1089 Lines: 29 On Mon, 2009-01-12 at 17:50 +0100, Peter Zijlstra wrote: > > > > (the file stat run is total run time, so lower is better. The other > > numbers are files or MB per second, so higher is better) > > > > For the file create run, v8 had much lower system time than v7, > > averaging 1s of sys time per proc instead of 1.6s. > > Right, how about the spread in completion time, because that is the only > reason I tried this fairness stuff, because you reported massive > differences there. > I reran the numbers with a slightly different kernel config and they have changed somewhat. These are just for the 4k file create run, all numbers in files created per second (and the numbers are stable across runs) v8 avg 176.90 median 171.85 std 12.49 high 215.97 low 165.54 v7 avg 169.02 median 163.77 std 16.82 high 267.95 low 157.95 -chris -- 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/