From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 24 Sep 2002 20:26:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 24 Sep 2002 20:26:32 -0400 Received: from packet.digeo.com ([12.110.80.53]:10935 "EHLO packet.digeo.com") by vger.kernel.org with ESMTP id ; Tue, 24 Sep 2002 20:26:31 -0400 Message-ID: <3D9103EB.FC13A744@digeo.com> Date: Tue, 24 Sep 2002 17:31:39 -0700 From: Andrew Morton X-Mailer: Mozilla 4.79 [en] (X11; U; Linux 2.4.19-rc5 i686) X-Accept-Language: en MIME-Version: 1.0 To: William Lee Irwin III CC: linux-kernel@vger.kernel.org Subject: Re: 2.5.38-mm2 dbench $N times References: <20020924132031.GJ6070@holomorphy.com> <3D90A532.4B95C06B@digeo.com> <20020925001826.GM6070@holomorphy.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 25 Sep 2002 00:31:40.0213 (UTC) FILETIME=[EA4D3E50:01C2642A] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org William Lee Irwin III wrote: > > William Lee Irwin III wrote: > >> Taken on 32x/32G NUMA-Q: > >> Throughput 67.3949 MB/sec (NB=84.2436 MB/sec 673.949 MBit/sec) 16 procs > >> dbench 16 11.72s user 122.21s system 422% cpu 31.733 total > > On Tue, Sep 24, 2002 at 10:47:30AM -0700, Andrew Morton wrote: > > Taken on 2x/0.8G el-scruffo PC: > > Throughput 135.02 MB/sec (NB=168.775 MB/sec 1350.2 MBit/sec) > > ./dbench 16 12.11s user 16.29s system 181% cpu 15.646 total > > What's up with that? > > Not sure. This is boot bay SCSI crud, but single-disk FC looks > *worse* for no obvious reason. Multiple disk tests do much better > (about matching the el-scruffo PC numbers above). > dbench 16 on that sort of machine is a memory bandwidth test. And a dcache lock exerciser. It basically doesn't touch the disk. Something very bad is happening. Anton can get 3000 MByte/sec ;)