linux-kernel - Re: [RFC] IO scheduler based IO controller V6

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 27 Jul 2009 08:55:03 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Gui Jianfeng <guijianfeng@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, dm-devel@...hat.com,
	jens.axboe@...cle.com, nauman@...gle.com, dpshah@...gle.com,
	lizf@...fujitsu.com, mikew@...gle.com, fchecconi@...il.com,
	paolo.valente@...more.it, ryov@...inux.co.jp,
	fernando@....ntt.co.jp, s-uchida@...jp.nec.com, taka@...inux.co.jp,
	jmoyer@...hat.com, dhaval@...ux.vnet.ibm.com,
	balbir@...ux.vnet.ibm.com, righi.andrea@...il.com,
	m-ikeda@...jp.nec.com, jbaron@...hat.com, agk@...hat.com,
	snitzer@...hat.com, akpm@...ux-foundation.org, peterz@...radead.org
Subject: Re: [RFC] IO scheduler based IO controller V6

On Mon, Jul 27, 2009 at 10:10:34AM +0800, Gui Jianfeng wrote:
> Hi，
> 
> Here are some fio test results for IO Controller V6 built and not built.
> Iozone test results are also attached.
> 

Hi Gui,

Thanks a lot for some performance numbers. It seems to be a mixed chart.
Performance gains at some places and loss at others. I am curious about
that -7.0% for normal writes. Not sure what can contribute to that.

What was the value of "fairness" parameter when you ran those tests? Can you
please set fairness = 0 and re-run the tests (if you have already not done so).

By default fairness is set to 1 in V6. With fairness = 0, we should be very
close to existing CFQ behavior. If not, then we need to dive deeper and
see why variations are happening.

Is it also possible to run the same tests with V7. 

Thanks
Vivek

> Arch: X86
> Mem:  1G
> Disk: 320G
> IO Scheduler: CFQ
> 
> ============
> By normal read and write syscall.
> 
> Block Size:32K
> File Size: 1G * 10
> 
> Mode                    Normal read   |   Random read   |   Normal write   |   Random write | Direct read | Direct write
> 
> 2.6.31-rc1              47,932KiB/s       3,566KiB/s        45,693KiB/s        8,501KiB/s     50,088KiB/s   43,473KiB/s
> 
> 2.6.31-rc1-Vivek-V6     47,231KiB/s       3,411KiB/s        42,451KiB/s        8,714KiB/s     51,284KiB/s   42,341KiB/s
> 
> Performance             -1.5%             -4.4%             -7.0%              +2.5%          +2.4%         -2.6%
> 
> ============
> 
> By mmap.
> 
> Block Size:32K
> File Size: 500M
> 
> Mode                    Normal read   |   Random read   |   Normal write   |   Random write
> 
> 2.6.31-rc1              49,951KiB/s       3,245KiB/s        21,950KiB/s        2,771KiB/s
> 
> 2.6.31-rc1-Vivek-V6     49,951KiB/s       3,154KiB/s        22,593KiB/s        2,648KiB/s
> 
> Performance             0%                -2.8%             +2.9%              -4.4%
> 
> ============
>  
> By libaio calls
> 
> Block Size:32K
> File Size: 500M
> 
> Mode                    Normal read   |  Random read   |   Normal write   |   Random write
> 
> 2.6.31-rc1              49,447KiB/s       3,296KiB/s        57,519KiB/s        21,093KiB/s
> 
> 2.6.31-rc1-Vivek-V6     50,142KiB/s       3,238KiB/s        57,791KiB/s        21,283KiB/s
> 
> Performance             +1.4%             -1.8%             0%                 +0.1%
> 
> ============
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/