Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752598AbZKPSiC (ORCPT ); Mon, 16 Nov 2009 13:38:02 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752130AbZKPSiB (ORCPT ); Mon, 16 Nov 2009 13:38:01 -0500 Received: from mail-gx0-f226.google.com ([209.85.217.226]:40561 "EHLO mail-gx0-f226.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751033AbZKPSiA convert rfc822-to-8bit (ORCPT ); Mon, 16 Nov 2009 13:38:00 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=OpnB4smijNj2lgcJZhDnyGoxlSyAFwWWPbiNDUyqyeb8QaefcZa/XHGDNnvabO2G7K yko6K7p5FxWxLVvWBYSD9nf1id+GUQMLkprUpTVnWBa0O145by5N9XAzMybs7Hm9BnMw 9Ol2/DIVpCsiy1ako3Vd4wIF/bsmyswKJg6HE= MIME-Version: 1.0 In-Reply-To: References: <20091026172012.GC7233@duck.suse.cz> <20091111141031.GA21511@duck.suse.cz> <20091112172941.GK14528@duck.suse.cz> <20091116104744.GC23231@duck.suse.cz> <20091116165804.GA19230@duck.suse.cz> Date: Mon, 16 Nov 2009 19:38:06 +0100 Message-ID: <4e5e476b0911161038w61b4bc6ay59c381f0543e9575@mail.gmail.com> Subject: Re: Performance regression in IO scheduler still there From: Corrado Zoccolo To: Jeff Moyer Cc: Jan Kara , jens.axboe@oracle.com, LKML , Chris Mason , Andrew Morton , Mike Galbraith , mszeredi@suse.de Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1932 Lines: 52 On Mon, Nov 16, 2009 at 6:03 PM, Jeff Moyer wrote: > Jan Kara writes: > >> On Mon 16-11-09 11:47:44, Jan Kara wrote: >>   OK, here are the numbers (3 runs of each test): >> 2.6.29: >> Threads       Avg             Stddev >> 1     42.043333       0.860439 >> 2     40.836667       0.322938 >> 4     41.810000       0.114310 >> 8     40.190000       0.419603 >> 16    39.950000       0.403072 >> 32    39.373333       0.766913 >> >> 2.6.32-rc7: >> Threads       Avg             Stddev >> 1     41.580000       0.403072 >> 2     39.163333       0.374641 >> 4     39.483333       0.400111 >> 8     38.560000       0.106145 >> 16    37.966667       0.098770 >> 32    36.476667       0.032998 >> >>   So apparently the difference between 2.6.29 and 2.6.32-rc7 increases as >> the number of threads rises. With how many threads have you been running >> when using SATA drive and what machine is it? >>   I'm now running a test with larger file size (8GB instead of 4) to see >> what difference it makes. > > I've been running with both 8 and 16 threads.  The machine has 4 CPUs > and 4GB of RAM.  I've been testing with an 8GB file size. Other details may be relevant, e.g.the file system on which the file is located, whether the caches are dropped before starting each run, and so on. Corrado > > Cheers, > Jeff > -- > 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/ > -- 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/