linux-kernel - Re: [PATCH] readahead:add blk_run_backing

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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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