linux-kernel - Re: Block IO Controller V4

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Message-ID: <4B1CC0BD.1000405@cn.fujitsu.com>
Date:	Mon, 07 Dec 2009 16:45:49 +0800
From:	Gui Jianfeng <guijianfeng@...fujitsu.com>
To:	Vivek Goyal <vgoyal@...hat.com>, jens.axboe@...cle.com
CC:	linux-kernel@...r.kernel.org, nauman@...gle.com, dpshah@...gle.com,
	lizf@...fujitsu.com, ryov@...inux.co.jp, fernando@....ntt.co.jp,
	s-uchida@...jp.nec.com, taka@...inux.co.jp, jmoyer@...hat.com,
	righi.andrea@...il.com, m-ikeda@...jp.nec.com, czoccolo@...il.com,
	Alan.Brunelle@...com
Subject: Re: Block IO Controller V4

Vivek Goyal wrote:
> On Thu, Dec 03, 2009 at 01:10:03PM -0500, Vivek Goyal wrote:
> 
> [..]
>> Hi Gui,
>>
>> Can you please try following patch and see if it helps you. If not, then
>> we need to figure out why we choose to not idle and delete the group from
>> service tree.
>>
> 
> Hi Gui,
> 
> Please try this version of the patch instead of previous one. During more
> testing I saw some additional deletions where we should have waited and
> the reason being that we were hitting boundary condition. At the request
> completion time slice has not expired but after 4-5 ns, select_queue hits
> and jiffy has incremented by then and slice expires.
> 
> ttime_mean, is not covering this condition because this workload is so
> sequential that ttime_mean=0.
> 
> So I am checking for new condition where if we are into last ms of slice,
> mark the queue wait_busy.
> 
> Thanks
> Vivek
> 
> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>

Hi, Vivek

I add some debug message in select_queue, it does meet the boundary condition. 
I tried this patch, and works fine on my box.

Acked-by: Gui Jianfeng <guijiafneng@...fujitsu.com>

Thanks,
Gui

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