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Message-Id: <20090601120524.4F5A.A69D9226@jp.fujitsu.com>
Date: Mon, 1 Jun 2009 12:06:44 +0900 (JST)
From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To: Wu Fengguang <fengguang.wu@...el.com>
Cc: kosaki.motohiro@...fujitsu.com,
Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>,
Andrew Morton <akpm@...ux-foundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
"jens.axboe@...cle.com" <jens.axboe@...cle.com>
Subject: Re: [PATCH] readahead:add blk_run_backing_dev
> > >> >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.
> > >
> > >What's your readahead size? Is it large enough to cover the stripe width?
> >
> > Do you mean strage's readahead size?
>
> What's strage? I mean if your RAID's block device file is /dev/sda, then
I guess it's typo :-)
but I recommend he use sane test environment...
>
> blockdev --getra /dev/sda
>
> will tell its readahead size in unit of 512 bytes.
>
> Thanks,
> Fengguang
>
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