linux-kernel - Re: [RFC PATCH] cfq-iosched: IOPS mode for group scheduling and new group

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Date:	Fri, 23 Jul 2010 16:03:43 +0200
From:	Heinz Diehl <htd@...cy-poultry.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-kernel@...r.kernel.org, jaxboe@...ionio.com,
	nauman@...gle.com, dpshah@...gle.com, guijianfeng@...fujitsu.com,
	jmoyer@...hat.com, czoccolo@...il.com
Subject: Re: [RFC PATCH] cfq-iosched: IOPS mode for group scheduling and new
 group_idle tunable

On 23.07.2010, Vivek Goyal wrote: 

> This is V4 of the patchset which implements a new tunable group_idle and also
> implements IOPS mode for group fairness. Following are changes since V3.
[....]

Just for information: this patchset, applied to 2.6.35-rc6, gives about
20-25% increase in speed/throughput on my desktop system 
(Phenom 2.5GHz Quadcore, 3 disks) with the tunables set according 
to what you've used/reported here (the setup with slice_idle set to 0),
and it's measurable with fs_mark, too.

After 2 hours of hard testing, the machine remains stable and responsive.

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