Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265534AbUFIElT (ORCPT ); Wed, 9 Jun 2004 00:41:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265542AbUFIElS (ORCPT ); Wed, 9 Jun 2004 00:41:18 -0400 Received: from gizmo01bw.bigpond.com ([144.140.70.11]:28314 "HELO gizmo01bw.bigpond.com") by vger.kernel.org with SMTP id S265534AbUFIElN (ORCPT ); Wed, 9 Jun 2004 00:41:13 -0400 Message-ID: <40C694E3.7030509@bigpond.net.au> Date: Wed, 09 Jun 2004 14:41:07 +1000 From: Peter Williams User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Con Kolivas CC: Phy Prabab , linux-kernel@vger.kernel.org Subject: Re: slow down in 2.6 vs 2.4 References: <1086744927.40c6695f9c361@vds.kolivas.org> In-Reply-To: <1086744927.40c6695f9c361@vds.kolivas.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1449 Lines: 48 Con Kolivas wrote: > Hi Phy > > You said: > Over the last two days I have been struggling with > understanding why 2.6.x kernel is slower than > 2.4.21/23 kernels. I think I have a test case which > demostrates this issue. > make times: > > 2.4.21: > 323.68user 56.07system 6:35.77elapsed 95%CPU > (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (3138783major+3818347minor)pagefaults > 0swaps > > 2.6.7-rc3-s63 (SPA scheduler): > 334.01user 69.86system 7:01.47elapsed 95%CPU > (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (13301major+6931745minor)pagefaults > 0swaps > > 2.6.7-rc3: > 336.17user 68.41system 7:02.47elapsed 95%CPU > (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (13301major+6931745minor)pagefaults > 0swaps > > > ---- > Your 2.4 compile is showing a massive number of major page faults. Seems to be roughly the same total number of page faults in all three cases but there's been a big shift from majors to minors for the 2.6 kernels which I would have thought would improve performance? Peter -- Dr Peter Williams pwil3058@bigpond.net.au "Learning, n. The kind of ignorance distinguishing the studious." -- Ambrose Bierce - 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/