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

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Date:	Sat, 24 Jul 2010 10:06:13 +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: 

> Anyway, for fs_mark problem, can you give following patch a try.
> https://patchwork.kernel.org/patch/113061/

Ported it to 2.6.35-rc6, and these are my results using the same fs_mark
call as before:

slice_idle = 0

FSUse%        Count         Size    Files/sec     App Overhead
    28         1000        65536        241.6            39574
    28         2000        65536        231.1            39939
    28         3000        65536        230.4            39722
    28         4000        65536        243.2            39646
    28         5000        65536        227.0            39892
    28         6000        65536        224.1            39555
    28         7000        65536        228.2            39761
    28         8000        65536        235.3            39766
    28         9000        65536        237.3            40518
    28        10000        65536        225.7            39861
    28        11000        65536        227.2            39441


slice_idle = 8

FSUse%        Count         Size    Files/sec     App Overhead
    28         1000        65536        502.2            30545
    28         2000        65536        407.6            29406
    28         3000        65536        381.8            30152
    28         4000        65536        438.1            30038
    28         5000        65536        447.5            30477
    28         6000        65536        422.0            29610
    28         7000        65536        383.1            30327
    28         8000        65536        415.3            30102
    28         9000        65536        397.6            31013
    28        10000        65536        401.4            29201
    28        11000        65536        408.8            29720
    28        12000        65536        391.2            29157

Huh...there's quite a difference! It's definitely the slice_idle settings
which affect the results here. Besides, this patch gives noticeably bad
desktop interactivity on my system.

Don't know if this is related, but I'm not quite shure if XFS (which I use
exclusively) uses the jbd/jbd2 journaling layer at all.

Thanks,
Heinz.
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