linux-kernel - Re: Performance regression in IO scheduler still there

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]

Message-ID: <20091110183730.GA27326@duck.suse.cz>
Date:	Tue, 10 Nov 2009 19:37:30 +0100
From:	Jan Kara <jack@...e.cz>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Corrado Zoccolo <czoccolo@...il.com>, Jan Kara <jack@...e.cz>,
	jens.axboe@...cle.com, LKML <linux-kernel@...r.kernel.org>,
	Chris Mason <chris.mason@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>
Subject: Re: Performance regression in IO scheduler still there

On Fri 06-11-09 09:14:53, Jeff Moyer wrote:
> Corrado Zoccolo <czoccolo@...il.com> writes:
> 
> > Hi Jeff,
> > what hardware are you using for tests?
> > I see aggregated random read bandwidth is larger than sequential read
> > bandwidth, and write bandwidth greater than read.
> > Is this a SAN with multiple independent spindles?
> 
> Yeah, this is a single path to an HP EVA storage array.  There are 24 or
> so disks striped in the pool used to create the volume I am using.  Jan,
> could you repeat your tests with /sys/block/sdX/queue/iosched/low_latency
> set to 0?
  I'll give it a spin tomorrow...

									Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
--
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/