Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265520AbUFID6m (ORCPT ); Tue, 8 Jun 2004 23:58:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265521AbUFID6m (ORCPT ); Tue, 8 Jun 2004 23:58:42 -0400 Received: from bhhdoa.org.au ([216.17.101.199]:46861 "EHLO bhhdoa.org.au") by vger.kernel.org with ESMTP id S265520AbUFID6k (ORCPT ); Tue, 8 Jun 2004 23:58:40 -0400 Message-ID: <1086744927.40c6695f9c361@vds.kolivas.org> Date: Wed, 9 Jun 2004 11:35:27 +1000 From: Con Kolivas To: Phy Prabab Cc: linux-kernel@vger.kernel.org Subject: Re: slow down in 2.6 vs 2.4 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT User-Agent: Internet Messaging Program (IMP) 3.2.2 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1116 Lines: 42 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. Just how big is this compile you do? Can you try running the 2.6 compile with echo 100 > /proc/sys/vm/swappiness Con - 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/