linux-kernel - Re: [PATCH 8/9] rsxx: Fixes CPU usage issues on RHEL 6 Kernels.

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:	Wed, 1 May 2013 09:34:49 -0500
From:	"Philip J. Kelleher" <pjk1939@...ux.vnet.ibm.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-kernel@...r.kernel.org, klebers@...ux.vnet.ibm.com,
	brking@...ux.vnet.ibm.com
Subject: Re: [PATCH 8/9] rsxx: Fixes CPU usage issues on RHEL 6 Kernels.

Again, thanks for the prompt reply.

Also, sorry for my poor explaination skills :)

The RHEL 6.x version of the driver is using the legacy
worqueue create function, 'create_singlethread_workqueue'.
This would cause heavy usage of one CPU if data was being
thrashed pretty hard. So, in order to fix it, workqueues
are now being created with 'create_workqueue' and
synchronization with mutexes.

Thanks,
-Philip Kelleher


On Wed, May 01, 2013 at 01:44:20PM +0200, Jens Axboe wrote:
> On Tue, Apr 30 2013, Philip J. Kelleher wrote:
> > From: Philip J Kelleher <pjk1939@...ux.vnet.ibm.com>
> > 
> > This changes how the driver schedules the work to the
> > workqueue threads. 
> > 
> > Note: This patch is primarily for the Red Hat 6 Kernels.
> 
> You need to properly explain the problem and how it's fixed in the
> changelog. The above really makes the read none the wiser on what the
> issue is.
> 
> -- 
> Jens Axboe
> 

--
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/