From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263546AbTJVLKg (ORCPT ); Wed, 22 Oct 2003 07:10:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263540AbTJVLKg (ORCPT ); Wed, 22 Oct 2003 07:10:36 -0400 Received: from mailgate.imerge.co.uk ([195.217.208.100]:19469 "EHLO imgserv04.imerge-bh.co.uk") by vger.kernel.org with ESMTP id S263546AbTJVLKe (ORCPT ); Wed, 22 Oct 2003 07:10:34 -0400 Message-ID: From: James Finnie To: "'James Courtier-Dutton'" Cc: "'linux-kernel@vger.kernel.org'" Subject: RE: VIA IDE performance under 2.6.0-test7/8? Date: Wed, 22 Oct 2003 12:11:00 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > Can you also send the output from "cat /proc/interrupts". > It looks like you are not using IO-APIC, but instead using XT-PIC. > XT-PIC is a lot slower than IO-APIC. I am indeed using the XT-PIC, but I was using it under 2.4.21 also, so I doubt that is the cause of the problems, especially seeing as bartlomiej's suggestion of increasing the read-ahead caching worked a treat. * Does anyone know why the values of the read-ahead caching are so different between 2.4.x and 2.6.0-test7/8? It seems to me that there are two problems; A) the meaning of the readahead value has changed (almost guaranteed, as in 2.4.21 I can't set anything above 255) B) the default of 256 is low, as the default in 2.4 of 8 gave me 40Mb/sec and the default of 256 in 2.6 gives me only 13Mb/s! I couldn't see any reference to this change of behaviour anywhere on the kernel mailing list archives. > Just turn on SMB support in the "make menuconf", and it should enable > IO-APIC. I'll give it a go just in case, however I don't like building kernels with SMP when I have no need for it. Cheers James ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Imerge Limited Tel :- +44 (0)1954 783600 Unit 6 Bar Hill Business Park Fax :- +44 (0)1954 783601 Saxon Way Web :- http://www.imerge.co.uk Bar Hill Cambridge CB3 8SL United Kingdom ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~