Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261991AbVDLBE5 (ORCPT ); Mon, 11 Apr 2005 21:04:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261996AbVDLBE5 (ORCPT ); Mon, 11 Apr 2005 21:04:57 -0400 Received: from omx2-ext.sgi.com ([192.48.171.19]:30891 "EHLO omx2.sgi.com") by vger.kernel.org with ESMTP id S261991AbVDLBEx (ORCPT ); Mon, 11 Apr 2005 21:04:53 -0400 Subject: Re: bdflush/rpciod high CPU utilization, profile does not make sense From: Greg Banks To: Jakob Oestergaard Cc: Trond Myklebust , Linux Kernel Mailing List In-Reply-To: <20050411154211.GG13369@unthought.net> References: <20050407153848.GN347@unthought.net> <1112890671.10366.44.camel@lade.trondhjem.org> <20050409213549.GW347@unthought.net> <1113083552.11982.17.camel@lade.trondhjem.org> <20050411074806.GX347@unthought.net> <1113222939.14281.17.camel@lade.trondhjem.org> <20050411134703.GC13369@unthought.net> <1113230125.9962.7.camel@lade.trondhjem.org> <20050411144127.GE13369@unthought.net> <1113232905.9962.15.camel@lade.trondhjem.org> <20050411154211.GG13369@unthought.net> Content-Type: text/plain Organization: Silicon Graphics Inc, Australian Software Group. Message-Id: <1113267809.1956.242.camel@hole.melbourne.sgi.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6-1mdk Date: Tue, 12 Apr 2005 11:03:29 +1000 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1202 Lines: 32 On Tue, 2005-04-12 at 01:42, Jakob Oestergaard wrote: > Yes, as far as I know - the Broadcom Tigeon3 driver does not have the > option of enabling/disabling RX polling (if we agree that is what we're > talking about), but looking in tg3.c it seems that it *always* > unconditionally uses NAPI... I've whined and moaned about this in the past, but for all its faults NAPI on tg3 doesn't lose packets. It does cause a huge increase in irq cpu time on multiple fast CPUs. What irq rate are you seeing? I did once post a patch to make NAPI for tg3 selectable at configure time. http://marc.theaimsgroup.com/?l=linux-netdev&m=107183822710263&w=2 > No dropped packets... I wonder if the tg3 driver is being completely > honest about this... At one point it wasn't, since this patch it is: http://marc.theaimsgroup.com/?l=linux-netdev&m=108433829603319&w=2 Greg. -- Greg Banks, R&D Software Engineer, SGI Australian Software Group. I don't speak for SGI. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/