linux-ext4 - Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

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:	Thu, 19 Apr 2007 14:46:30 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Valerie Clement <valerie.clement@...l.net>
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

On Thu, Apr 19 2007, Valerie Clement wrote:
> Jens Axboe wrote:
> >On Thu, Apr 19 2007, Valerie Clement wrote:
> >>Jens Axboe wrote:
> >>>Please tell me how you are running ffsb, and also please include a
> >>>dmessg from a booted system.
> >>>
> >>Hi,
> >>our mails crossed! please see my response to Andrew.
> >>You could reproduce the problem with dd command as suggested, it's more 
> >>easy.
> >>I'm sending you the dmesg info. For my tests I used the scsci sdc device.
> >
> >Thanks, it does. Can you try one thing for me? If you run the test on
> >sdc, try doing:
> >
> ># echo 64 > /sys/block/sdc/queue/iosched/quantum
> >
> >and repeat the test.
> >
> 
> OK, that's done.
> 
> With the change of quantum, the throughput scores are now a little bit 
> better in 2.6.21 than in 2.6.20.

Wonderful, now try the patch I sent in the next mail and repeat the
test.

-- 
Jens Axboe

-
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html