From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752229AbZDMR5a (ORCPT ); Mon, 13 Apr 2009 13:57:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751166AbZDMR5V (ORCPT ); Mon, 13 Apr 2009 13:57:21 -0400 Received: from out2.smtp.messagingengine.com ([66.111.4.26]:53771 "EHLO out2.smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750983AbZDMR5U (ORCPT ); Mon, 13 Apr 2009 13:57:20 -0400 Message-Id: <1239645439.14336.1310277599@webmail.messagingengine.com> X-Sasl-Enc: Qn3Zfphj6Ikgoz+RAbi2pKGUNHxYxgY99ql/DxJrJv33 1239645439 From: "Mr Blogs" To: linux-kernel@vger.kernel.org Content-Disposition: inline Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="iso-8859-1" MIME-Version: 1.0 X-Mailer: MessagingEngine.com Webmail Interface Subject: 2.6.27 - 2.6.29 upgrade.. RAID 0 CCISS now slower Date: Mon, 13 Apr 2009 10:57:19 -0700 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I am using Gentoo on a HP DL380 G3. Intel Xeon (P4) 3.06ghz processors, with a HP COMPAQ CCISS ARRAY in RAID 0 mode (hardware, linux just sees one single drive) hdparm on 2.6.27 shows the speed at ~ 130mbs After performing an upgrade of the kernel hdparm on 2.6.29 shows the speed at ~ 30mbs (30-50mbs varies) I looked at the DMESG comparisons, and the only difference is that 2.6.29 mentions: "IRQF_DISABLED is not guaranteed on shared IRQs" Now I have looked for hours to see if it was a configuration issue, but to no avail. Yes the 2.6.27 kernel was self built, and it works fine. The 2.6.29 was built using the .config file from the 2.6.27. I compiled this kernel on two servers, both same spec (well, one has 4GB ram other has 2GB ram), same setup - and both responded as above. On the one, I recompiled the kernel to just use the new version (NO config changes). The other I re-compiled using config changes (removing things not relevant for the machine etc) - both end up having this problem. I have done a "diff" compare on the configs, but there is nothing I can find that would explain this. I know that this "IRQF_DISABLED" warning isn't present in 2.6.27 boots, and that the CISS driver works full speed in that one. I thought it was originally that I changed the IO Scheduling, but as i said, on the one machine - all i did was copy the config file and recompile. Do you know of anything that could be causing this? I checked proc/interrupts on both kernel versions, and IRQ 30 is unshared (IO-APIC-FASTEOI cciss or something like that), i am just unsure what is causing the issue. Thankyou. -- Mr Blogs mrblogs@ssl-mail.com -- http://www.fastmail.fm - The way an email service should be