Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262890AbUCKAEH (ORCPT ); Wed, 10 Mar 2004 19:04:07 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262902AbUCKAEH (ORCPT ); Wed, 10 Mar 2004 19:04:07 -0500 Received: from palrel12.hp.com ([156.153.255.237]:64421 "EHLO palrel12.hp.com") by vger.kernel.org with ESMTP id S262890AbUCKAD7 (ORCPT ); Wed, 10 Mar 2004 19:03:59 -0500 From: David Mosberger MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16463.44267.253785.644266@napali.hpl.hp.com> Date: Wed, 10 Mar 2004 16:03:55 -0800 To: Andrew Morton Cc: jbarnes@sgi.com (Jesse Barnes), axboe@suse.de, linux-kernel@vger.kernel.org Subject: Re: [PATCH] backing dev unplugging In-Reply-To: <20040310155419.550c4a6a.akpm@osdl.org> References: <20040310115545.16cb387f.akpm@osdl.org> <200403102003.i2AK3qm16576@unix-os.sc.intel.com> <20040310202025.GH15087@suse.de> <20040310204532.GA10281@sgi.com> <20040310204936.GJ15087@suse.de> <20040310205237.GK15087@suse.de> <20040310210104.GA10406@sgi.com> <20040310210249.GM15087@suse.de> <20040310213509.GA10888@sgi.com> <20040310155419.550c4a6a.akpm@osdl.org> X-Mailer: VM 7.18 under Emacs 21.3.1 Reply-To: davidm@hpl.hp.com X-URL: http://www.hpl.hp.com/personal/David_Mosberger/ Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1356 Lines: 35 >>>>> On Wed, 10 Mar 2004 15:54:19 -0800, Andrew Morton said: Andrew> jbarnes@sgi.com (Jesse Barnes) wrote: >> >> ------------------------------------- >> w/Jens' patch: ~47149 I/Os per second Andrew> Happier. >> [root@revenue sio]# readprofile -m /root/System.map | sort -nr +2 >> | head -20 181993 default_idle 5687.2812 624772 snidle 1627.0104 >> 209129 cpu_idle 435.6854 4755 dio_bio_end_io 12.3828 6593 >> scsi_end_request 12.1195 435 ia64_spinlock_contention 6.7969 2959 >> sn_dma_flush 4.4033 Andrew> Do you know where that spinlock contention is coming from? Andrew> (We have a little patch for x86 which places the spinning Andrew> code inline in the caller of spin_lock() so it appears Andrew> nicely in profiles.) And real men use profiling tools that provide a call-graph, so this hack isn't necessary... ;-) Jesse, if you want to try q-tools and need some help in getting the per-CPU results merged, let me know (it's something that's planned for a future release, but there is only so many hours in a day so this hasn't been done yet). --david - 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/