linux-kernel - Re: [PATCH] CFQ: Don't store left slice when slice used up or for a idle workload

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Message-ID: <4C3D0762.2060807@cn.fujitsu.com>
Date:	Wed, 14 Jul 2010 08:40:02 +0800
From:	Gui Jianfeng <guijianfeng@...fujitsu.com>
To:	Jeff Moyer <jmoyer@...hat.com>
CC:	Jens Axboe <axboe@...nel.dk>, Vivek Goyal <vgoyal@...hat.com>,
	Corrado Zoccolo <czoccolo@...il.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] CFQ: Don't store left slice when slice used up or for
 a idle workload

Jeff Moyer wrote:
> Gui Jianfeng <guijianfeng@...fujitsu.com> writes:
> 
>> It doesn't make sence to store left time slice for an idle workload
>> or for the cfqq that uses up its slice.
> 
> Did you actually observe any problems?  As I understand it, if you
> overrun your slice you get a negative offset, so I think we want to keep
> that.

Hi Jeff

If that's the case, do we also need to store the negative offset when slice
used up in cfq_select_queue() and cfq_idle_slice_timer()?

Thanks
Gui

> 
> Cheers,
> Jeff
> 
> 
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