Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262279AbUCOFyX (ORCPT ); Mon, 15 Mar 2004 00:54:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262281AbUCOFyX (ORCPT ); Mon, 15 Mar 2004 00:54:23 -0500 Received: from fmr03.intel.com ([143.183.121.5]:18602 "EHLO hermes.sc.intel.com") by vger.kernel.org with ESMTP id S262279AbUCOFyV (ORCPT ); Mon, 15 Mar 2004 00:54:21 -0500 Message-Id: <200403150553.i2F5rum14058@unix-os.sc.intel.com> From: "Kenneth Chen" To: "'Andrew Morton'" , "Jens Axboe" Cc: , Subject: RE: [PATCH] backing dev unplugging Date: Sun, 14 Mar 2004 21:53:58 -0800 X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-Index: AcQG2W8rodshR8XpS2iBDfBt64JimwDdbiDQ In-Reply-To: <20040310115545.16cb387f.akpm@osdl.org> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1011 Lines: 25 >>>>>> Andrew Morton on Wed March 10, 2004 11:56 AM >Jens Axboe wrote: >> Here's a first cut at killing global plugging of block devices to reduce >> the nasty contention blk_plug_lock caused. This introduceds per-queue >> plugging, controlled by the backing_dev_info. > >This is such an improvement over what we have now it isn't funny. > >Ken, the next -mm is starting to look like linux-3.1.0 so I think it >would be best if you could benchmark Jens's patch against 2.6.4-rc2-mm1. Our latest measurement on the 32P, 1000 disks setup indicates this patch is working as expected performance wise. We saw 200% improvement on the throughput compare to global blk_plug_list. (compare to the per-cpu blk_plug_list, performance is the same). - Ken - 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/