From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751456Ab1ADFYc (ORCPT ); Tue, 4 Jan 2011 00:24:32 -0500 Received: from mail-bw0-f66.google.com ([209.85.214.66]:52239 "EHLO mail-bw0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750926Ab1ADFYa (ORCPT ); Tue, 4 Jan 2011 00:24:30 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=oohJQM3gfrCyo8hqwO2QbN2fUXrDeXZwcEIstdQ8fbDGftAgmfMR3QiUBFMqnD5aeT GxPPM/s+NF2+D4TGzfu3rPGZTaV4qQcM8CGnyVl8E4w/YnCrd+YVhcci3t0Bahmhgixq wECBwRNKxolzCk1foyXu+94xZkE4yokCQXWBA= Date: Tue, 4 Jan 2011 06:24:21 +0100 From: Tejun Heo To: "Kanigeri, Hari" Cc: linux-kernel@vger.kernel.org, Tony Lindgren , linux-omap@vger.kernel.org Subject: Re: [PATCH 01/32] arm/omap: use system_wq in mailbox Message-ID: <20110104052421.GD6748@mtj.dyndns.org> References: <1294062595-30097-1-git-send-email-tj@kernel.org> <1294062595-30097-2-git-send-email-tj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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