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: <x49r5j7plwy.fsf@segfault.boston.devel.redhat.com>
Date:	Tue, 13 Jul 2010 09:10:37 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Gui Jianfeng <guijianfeng@...fujitsu.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	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

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.

Cheers,
Jeff
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