From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with SMTP id D63D76B007E for ; Tue, 26 May 2009 23:26:17 -0400 (EDT) Received: from m2.gw.fujitsu.co.jp ([10.0.50.72]) by fgwmail6.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id n4R3QeJK009261 for (envelope-from kosaki.motohiro@jp.fujitsu.com); Wed, 27 May 2009 12:26:40 +0900 Received: from smail (m2 [127.0.0.1]) by outgoing.m2.gw.fujitsu.co.jp (Postfix) with ESMTP id 4CD9745DE5D for ; Wed, 27 May 2009 12:26:40 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (s2.gw.fujitsu.co.jp [10.0.50.92]) by m2.gw.fujitsu.co.jp (Postfix) with ESMTP id 2447745DE55 for ; Wed, 27 May 2009 12:26:40 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id EDE20E38005 for ; Wed, 27 May 2009 12:26:39 +0900 (JST) Received: from m105.s.css.fujitsu.com (m105.s.css.fujitsu.com [10.249.87.105]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id 9F0741DB8040 for ; Wed, 27 May 2009 12:26:39 +0900 (JST) From: KOSAKI Motohiro Subject: Re: [PATCH] readahead:add blk_run_backing_dev In-Reply-To: <6.0.0.20.2.20090527120248.076abe38@172.19.0.2> References: <20090527025721.GA11153@localhost> <6.0.0.20.2.20090527120248.076abe38@172.19.0.2> Message-Id: <20090527122540.6897.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Date: Wed, 27 May 2009 12:26:38 +0900 (JST) Sender: owner-linux-mm@kvack.org To: Hisashi Hifumi Cc: kosaki.motohiro@jp.fujitsu.com, Wu Fengguang , Andrew Morton , "linux-kernel@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "linux-mm@kvack.org" , "jens.axboe@oracle.com" List-ID: > >> >The numbers look too small for a 7 disk RAID: > >> > > >> > > #dd if=testdir/testfile of=/dev/null bs=16384 > >> > > > >> > > -2.6.30-rc6 > >> > > 1048576+0 records in > >> > > 1048576+0 records out > >> > > 17179869184 bytes (17 GB) copied, 224.182 seconds, 76.6 MB/s > >> > > > >> > > -2.6.30-rc6-patched > >> > > 1048576+0 records in > >> > > 1048576+0 records out > >> > > 17179869184 bytes (17 GB) copied, 206.465 seconds, 83.2 MB/s > >> > > >> >I'd suggest you to configure the array properly before coming back to > >> >measuring the impact of this patch. > >> > >> > >> I created 16GB file to this disk array, and mounted to testdir, dd to > >this directory. > > > >I mean, you should get >300MB/s throughput with 7 disks, and you > >should seek ways to achieve that before testing out this patch :-) > > Throughput number of storage array is very from one product to another. > On my hardware environment I think this number is valid and > my patch is effective. Hifumi-san, if you really want to merge, you should reproduce this issue on typical hardware, I think. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org