From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753424AbYITUBW (ORCPT ); Sat, 20 Sep 2008 16:01:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751519AbYITUBM (ORCPT ); Sat, 20 Sep 2008 16:01:12 -0400 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:50393 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751492AbYITUBK (ORCPT ); Sat, 20 Sep 2008 16:01:10 -0400 Date: Sat, 20 Sep 2008 13:00:58 -0700 (PDT) Message-Id: <20080920.130058.90080260.davem@davemloft.net> To: dwalker@mvista.com Cc: arjan@infradead.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, jens.axboe@oracle.com, steffen.klassert@secunet.com Subject: Re: [PATCH 0/2]: Remote softirq invocation infrastructure. From: David Miller In-Reply-To: <1221926529.1343.140.camel@localhost.localdomain> References: <1221924561.1343.121.camel@localhost.localdomain> <20080920084512.58f7fb08@infradead.org> <1221926529.1343.140.camel@localhost.localdomain> X-Mailer: Mew version 6.1 on Emacs 22.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Daniel Walker Date: Sat, 20 Sep 2008 09:02:09 -0700 > In the case of networking and block I would think a lot of the softirq > activity is asserted from userspace.. Maybe the scheduler shouldn't be > migrating these tasks, or could take this softirq activity into > account .. Absolutely wrong. On a per-flow basis you want to push the work down as far as possible down to individual cpus. Why do you think the hardware folks are devoting silicon to RX multiqueue facilities that spread the RX work amongst available cpus using MSI-X?