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

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Message-ID: <20100723141303.GB13104@redhat.com>
Date:	Fri, 23 Jul 2010 10:13:03 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Heinz Diehl <htd@...cy-poultry.org>
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 Fri, Jul 23, 2010 at 04:03:43PM +0200, Heinz Diehl wrote:
> 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.

Thanks for some testing Heinz. I am assuming you are not using cgroups
and blkio controller.

In that case, you are seeing improvements probably due to first patch
where we don't idle on service tree if slice_idle=0. Hence we cut down on
overall idling and can see throughput incrase.

What kind of configuration these 3 disks are on your system? Some Hardare
RAID or software RAID ?

Thanks
Vivek
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