linux-kernel - Re: How to track down abysmal performance ata - raid1 - crypto - vg/lv

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 for Android: free password hash cracker in your pocket

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

Date:	Wed, 4 Aug 2010 11:13:17 +0200
From:	Dominik Brodowski <linux@...inikbrodowski.net>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-raid@...r.kernel.org, xfs@....sgi.com,
	linux-kernel@...r.kernel.org
Subject: Re: How to track down abysmal performance ata - raid1 - crypto -
	vg/lv - xfs

Christoph,

On Wed, Aug 04, 2010 at 04:50:39AM -0400, Christoph Hellwig wrote:
> On Wed, Aug 04, 2010 at 09:35:46AM +0200, Dominik Brodowski wrote:
> > How can I best track down the cause of the performance problem, 
> > a) without rebooting too often, and
> > b) without breaking up the setup specified above (production system)?
> 
> So did you just upgrade the system from an earlier kernel that did not
> show these problems?

No, 2.6.31 to 2.6.34 show similar behaviour.

>  Or did no one notice them before?

Well, there are some reports relating to XFS on MD or RAID, though I couldn't
find a resolution to the issues reported, e.g.

- http://kerneltrap.org/mailarchive/linux-raid/2009/10/12/6490333
- http://lkml.indiana.edu/hypermail/linux/kernel/1006.1/00099.html

However, I think we can rule out barriers, as XFS is mounted "nobarrier"
here.

Best,
	Dominik
--
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/