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

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Date:	Mon, 26 Jul 2010 18:15:00 +0200
From:	Heinz Diehl <htd@...tha.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,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [RFC PATCH] cfq-iosched: IOPS mode for group scheduling and new
 group_idle tunable

On 26.07.2010, Vivek Goyal wrote: 

> How do you measure it? IOW, are you running something else also on the
> desktop in the background. Like a heavy writer etc and then measuring
> how interactive desktop feels?

I used Linus' "bigfile torture test" in the background:

 while : ; do time sh -c "dd if=/dev/zero of=bigfile bs=8M count=256 ;
 sync; rm bigfile"; done

and Theodore Tso's "fsync-tester" to benchmark interactivity. 

Didn't save any results, wasn't expecting that this could be of any
further interest (but can run the tests one more time, if desired).

Thanks,
Heinz.
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