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

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Message-ID: <20090629145147.GA29433@localhost>
Date:	Mon, 29 Jun 2009 22:51:47 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Ronald Moesbergen <intercommit@...il.com>
Cc:	Vladislav Bolkhovitin <vst@...b.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>,
	"Alan.Brunelle@...com" <Alan.Brunelle@...com>,
	"hifumi.hisashi@....ntt.co.jp" <hifumi.hisashi@....ntt.co.jp>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"jens.axboe@...cle.com" <jens.axboe@...cle.com>,
	"randy.dunlap@...cle.com" <randy.dunlap@...cle.com>,
	Bart Van Assche <bart.vanassche@...il.com>
Subject: Re: [RESEND] [PATCH] readahead:add blk_run_backing_dev

On Mon, Jun 29, 2009 at 10:43:48PM +0800, Ronald Moesbergen wrote:
> 2009/6/29 Wu Fengguang <fengguang.wu@...el.com>:
> > On Mon, Jun 29, 2009 at 09:13:27PM +0800, Wu Fengguang wrote:
> >> On Mon, Jun 29, 2009 at 09:04:57PM +0800, Vladislav Bolkhovitin wrote:
> >> > Wu Fengguang, on 06/29/2009 04:54 PM wrote:
> >> > >
> >> > > Why not 2.6.30? :)
> >> >
> >> > We started with 2.6.29, so why not complete with it (to save additional
> >> > Ronald's effort to move on 2.6.30)?
> >>
> >> OK, that's fair enough.
> >
> > btw, I backported the 2.6.31 context readahead patches to 2.6.29, just
> > in case it will help the SCST performance.
> >
> > Ronald, if you run context readahead, please make sure that the server
> > side readahead size is bigger than the client side readahead size.
> 
> I tried this patch on a vanilla kernel and no other patches applied,
> but it does not seem to help. The iSCSI throughput does not go above
> 60MB/s. (1GB in 17 seconds). I have tried several readahead settings
> from 128KB up to 4MB and kept the server readahead at twice the client
> readahead, but it never comes above 60MB/s. This is using SCST on the

OK, thanks for the tests anyway!

> serverside and openiscsi on the client. I get much better throughput
> (90 MB/s) when using the patches supplied with SCST, together with the

What do you mean by "patches supplied with SCST"?

> blk_run_backing_dev readahead patch.

Thanks,
Fengguang
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