From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vladislav Bolkhovitin Subject: Re: [RESEND] [PATCH] readahead:add blk_run_backing_dev Date: Fri, 10 Jul 2009 12:43:30 +0400 Message-ID: <4A56FF32.2060303@vlnb.net> References: <4A3CD62B.1020407@vlnb.net> <4A4DE3C1.5080307@vlnb.net> <4A51DC0A.10302@vlnb.net> <4A5238EC.1070505@vlnb.net> <4A5395FD.2040507@vlnb.net> <4A5493A8.2000806@vlnb.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: fengguang.wu@intel.com, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, kosaki.motohiro@jp.fujitsu.com, Alan.Brunelle@hp.com, hifumi.hisashi@oss.ntt.co.jp, linux-fsdevel@vger.kernel.org, jens.axboe@oracle.com, randy.dunlap@oracle.com, Bart Van Assche To: Ronald Moesbergen Return-path: Received: from moutng.kundenserver.de ([212.227.126.186]:59413 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750794AbZGJInr (ORCPT ); Fri, 10 Jul 2009 04:43:47 -0400 In-Reply-To: Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Ronald Moesbergen, on 07/10/2009 10:32 AM wrote: >> I've also long ago noticed that reading data from block devices is slower >> than from files from mounted on those block devices file systems. Can >> anybody explain it? >> >> Looks like this is strangeness #2 which we uncovered in our tests (the first >> one was earlier in this thread why the context RA doesn't work with >> cooperative I/O threads as good as it should). >> >> Can you rerun the same 11 tests over a file on the file system, please? > > I'll see what I can do. Just te be sure: you want me to run > blockdev-perftest on a file on the OCFS2 filesystem which is mounted > on the client over iScsi, right? Yes, please. > Ronald. > -- > 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/ >