linux-kernel - Re: [PATCH 01/32] arm/omap: use system

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Date:	Tue, 4 Jan 2011 06:24:21 +0100
From:	Tejun Heo <tj@...nel.org>
To:	"Kanigeri, Hari" <h-kanigeri2@...com>
Cc:	linux-kernel@...r.kernel.org, Tony Lindgren <tony@...mide.com>,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH 01/32] arm/omap: use system_wq in mailbox

Hello,

On Mon, Jan 03, 2011 at 03:35:45PM -0600, Kanigeri, Hari wrote:
> This was changed to dedicated work queue because of performance issues
> when there is heavy mailbox traffic between the cores.
> 
> Reference:
> http://www.mail-archive.com/linux-omap@vger.kernel.org/msg24240.html

Using dedicated workqueue or system_wq doesn't make any difference in
terms of execution latency anymore.  Sleeping work items no longer
delay execution of other work items.  If mailbox is very latency
sensitive, it might make sense to create a HIGHPRI workqueue but that
usually isn't necessary.

Thank you.

--
tejun
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