Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932969Ab0FBTUY (ORCPT ); Wed, 2 Jun 2010 15:20:24 -0400 Received: from g1t0026.austin.hp.com ([15.216.28.33]:34449 "EHLO g1t0026.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932932Ab0FBTUW (ORCPT ); Wed, 2 Jun 2010 15:20:22 -0400 From: Bjorn Helgaas To: Bert dd Subject: Re: Is there a way to change irq numbers of pcie cards ? Date: Wed, 2 Jun 2010 13:19:59 -0600 User-Agent: KMail/1.13.2 (Linux/2.6.32-22-generic; KDE/4.4.2; x86_64; ; ) Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org References: In-Reply-To: MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <201006021319.59402.bjorn.helgaas@hp.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1602 Lines: 39 [I added linux-pci, where more PCI-savvy people will see it.] On Wednesday, June 02, 2010 06:08:33 am Bert dd wrote: > Hi, > Is there a way to change irq numbers of pcie cards ? > > I have a supermicro machine with 2 raid cards (lsi 9260-8i and lsi 9260-8e) and > one nvidia GTX480 graphics card. > The problem is that all these pcie cards are assigned the same irq number, > and thus all the interrupts are routed to the same cpu which can not > handle this. > If I replace the nvidia GTX480 with an older graphics card(too old for > our purposes (GTX295)), the graphics card gets a different irq number > than the raid cards, the interrups of the graphics card are handled by > a different cpu than those of the raid cards, and the read/write speed > of the raid increases. > I am reading/writing at 2.5 GB/s to the raid and I am uploading > textures at 0.5 GB/s to the graphics hardware. > Is there a way to change the irq numbers of the pcie cards ? > I am using IOAPIC for interrupt routing. I would think performance-oriented PCIe devices would be using some sort of MSI, but I'm not really an expert in that area. Can you post your /proc/interrupts and complete dmesg log in case nobody jumps in with an obvious answer? Bjorn > I am using ubuntu - kernel version 2.6.31-14-generic. > > thanks, > Bert De Decker > bert.dedecker@uhasselt.be -- 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/