Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 23 Mar 2003 22:59:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 23 Mar 2003 22:59:14 -0500 Received: from franka.aracnet.com ([216.99.193.44]:6340 "EHLO franka.aracnet.com") by vger.kernel.org with ESMTP id ; Sun, 23 Mar 2003 22:59:05 -0500 Date: Sun, 23 Mar 2003 20:10:05 -0800 From: "Martin J. Bligh" To: Andrew Morton cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: 2.5.65-mm4 Message-ID: <11750000.1048479004@[10.10.2.4]> In-Reply-To: <20030323191744.56537860.akpm@digeo.com> References: <20030323020646.0dfcc17b.akpm@digeo.com> <9590000.1048475057@[10.10.2.4]> <20030323191744.56537860.akpm@digeo.com> X-Mailer: Mulberry/2.2.1 (Linux/x86) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1463 Lines: 46 >> profile from SDET 64: > > SDET is rather irritating because a) nobody has a copy and b) we don't > even know what it does. Yeah, I know. sorry ... I'm trying to get aim7 done instead. > and b) we don't even know what it does. Lots of shell scripty stuff, I think. >> 82303 __down >> 42835 schedule >> 31323 __wake_up >> 26435 .text.lock.sched >> 15924 .text.lock.transaction > > But judging by this, it's a rebadged dbench. The profile is identical. Not sure what dbench does. But I'm probably doing lots of small reads and writes inside pagecache. > Note that the lock_kernel() contention has been drastically reduced and > we're now hitting semaphore contention. > > Running `dbench 32' on the quad Xeon, this patch took the context switch > rate from 500/sec up to 125,000/sec. > > I've asked Alex to put together a patch for spinlock-based locking in the > block allocator (cut-n-paste from ext2). OK, sounds like a plan. Made a huge impact for ext2, and might enable us to actually be able to see the rest of it through the sem cloud. > That will fix up lock_super(), but I suspect the main problem is the > lock_journal() in journal_start(). I haven't thought about that one yet. Thanks, M. - 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/