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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4A48DFBA.1070608@vlnb.net>
Date:	Mon, 29 Jun 2009 19:37:30 +0400
From:	Vladislav Bolkhovitin <vst@...b.net>
To:	Wu Fengguang <fengguang.wu@...el.com>
CC:	Ronald Moesbergen <intercommit@...il.com>,
	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


Wu Fengguang, on 06/29/2009 06:51 PM wrote:
> 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"?

Ronald means io_context patch 
(http://scst.svn.sourceforge.net/viewvc/scst/trunk/scst/kernel/io_context-2.6.29.patch?revision=717), 
which allows SCST's I/O threads to share a single IO context.

Vlad

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/