From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757676AbZB0PG3 (ORCPT ); Fri, 27 Feb 2009 10:06:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754550AbZB0PGS (ORCPT ); Fri, 27 Feb 2009 10:06:18 -0500 Received: from casper.infradead.org ([85.118.1.10]:44599 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752801AbZB0PGS (ORCPT ); Fri, 27 Feb 2009 10:06:18 -0500 Date: Fri, 27 Feb 2009 07:06:33 -0800 From: Arjan van de Ven To: Peter Zijlstra Cc: Andrew Morton , Thomas Gleixner , linux-kernel@vger.kernel.org, mingo@elte.hu, rostedt@goodmis.org, jonathan@jonmasters.org Subject: Re: [patch 4/4] genirq: add support for threaded interrupt handlers Message-ID: <20090227070633.2c3fc04e@infradead.org> In-Reply-To: <1235721910.4948.1321.camel@laptop> References: <20090226131336.423054348@linutronix.de> <20090226131719.760899560@linutronix.de> <20090226153216.5db66bc3.akpm@linux-foundation.org> <20090226212752.332ba546@infradead.org> <20090226214514.f8a58731.akpm@linux-foundation.org> <1235719113.4948.1252.camel@laptop> <20090226234800.4977fca5.akpm@linux-foundation.org> <1235721910.4948.1321.camel@laptop> Organization: Intel X-Mailer: Claws Mail 3.7.0 (GTK+ 2.14.7; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 27 Feb 2009 09:05:10 +0100 Peter Zijlstra wrote: > > Right, Thomas did the EHCI usb driver, the network driver you propose > is a tad hard since it relies on the whole network stack softirq > stuff. Re-working the whole net-stack to make use of threaded > handlers is a massive undertaking -- although I seem to remember > someone doing it a few years back and seeing a general performance > improvement, Thomas still got a link to that work? we shouldn't have to; just running the softirq handler from the irq thread should work, and not lose real performance. Sure you're not going to get a performance gain that you could get but it still works. or am I missing something? (and esp for things like wireless drivers, that should be just fine; I can understand hesitation to do 10g ethernet drivers right away ;-) -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org