Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264062AbUDBT4N (ORCPT ); Fri, 2 Apr 2004 14:56:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264088AbUDBT4N (ORCPT ); Fri, 2 Apr 2004 14:56:13 -0500 Received: from fw.osdl.org ([65.172.181.6]:10159 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S264062AbUDBT4I (ORCPT ); Fri, 2 Apr 2004 14:56:08 -0500 Date: Fri, 2 Apr 2004 11:56:01 -0800 From: Andrew Morton To: markw@osdl.org Cc: linux-kernel@vger.kernel.org, Jens Axboe Subject: Re: 2.6.5-rc3-mm4 Message-Id: <20040402115601.24912093.akpm@osdl.org> In-Reply-To: <200404021904.i32J4M215682@mail.osdl.org> References: <20040401020512.0db54102.akpm@osdl.org> <200404021904.i32J4M215682@mail.osdl.org> X-Mailer: Sylpheed version 0.9.7 (GTK+ 1.2.10; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1953 Lines: 44 markw@osdl.org wrote: > > I reran DBT-2 to with ext2 and ext3 (in case you were still interested) > on my 4-way Xeon system with 60+ drives: > http://developer.osdl.org/markw/fs/dbt2_project_results.html > > Aside from the from the drop you're already aware of since 2.6.3, it > looks like DBT-2 takes another smaller hit after 2.6.5-rc3-mm2. Here's > a brief summary from the link above: The profile is interesting: 3671973 poll_idle 63309.8793 77750 __copy_from_user_ll 637.2951 64788 generic_unplug_device 487.1278 62968 DAC960_LP_InterruptHandler 336.7273 53908 finish_task_switch 361.7987 52947 __copy_to_user_ll 441.2250 29419 dm_table_unplug_all 439.0896 25947 __make_request 17.9938 18564 dm_table_any_congested 199.6129 13785 update_queue 104.4318 13498 try_to_wake_up 20.3590 12736 __wake_up 114.7387 12560 kmem_cache_alloc 163.1169 12221 .text.lock.sched 40.7367 - There's a ton of idle time there. - The CPU scheduler is hurting. Nick and Ingo are patching up a storm to fix a similar problem which Jeremy Higdon is observing at 200,000 IOs/sec. This will get better. - That 60-disk LVM array is costing us in the new unplug and congestion code. Jens, didn't you have a tune-up for that in the works? - I'm surprised that you didn't see big gains from ext3-fsync-speedup, even though it appears that the test uses fdatasync(). - 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/