From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ming Zhang Subject: Re: hwo to adjust interrupt? Date: Fri, 12 Aug 2005 09:14:35 -0400 Message-ID: <1123852475.5546.22.camel@localhost.localdomain> References: <1123799468.5546.81.camel@localhost.localdomain> <1123830899.3218.15.camel@laptopd505.fenrus.org> Reply-To: mingz@ele.uri.edu Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from leviathan.ele.uri.edu ([131.128.51.64]:7043 "EHLO leviathan.ele.uri.edu") by vger.kernel.org with ESMTP id S1751170AbVHLNOq (ORCPT ); Fri, 12 Aug 2005 09:14:46 -0400 In-Reply-To: <1123830899.3218.15.camel@laptopd505.fenrus.org> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Arjan van de Ven Cc: linux-scsi On Fri, 2005-08-12 at 09:14 +0200, Arjan van de Ven wrote: > On Thu, 2005-08-11 at 18:31 -0400, Ming Zhang wrote: > > I have this eth1 and aic7xxx share 1 interrupt thus have impact on > > performance, anyway i can change it? thx! > > realistically, either you need to find a bios setting tweak, or you need > to move one of the two to a different pci slot in the machine. > i could not find any bios setting in the bios. it is a dell sc420. i will try to move card around and see what happen. thx! > > (Not that it's a big problem, sharing irqs on a pci system isn't too big > a deal) > i use it as my iscsi testbed so the sole activities are disk&network. that is why i am worrying about it. do you think it is ok to share? i think at least kernel need to find 1 irq handler to process the handler, then it have 1/2 chance (roughly assume 1 network interrupt corresponding to 1 storage io interrupt, of course this is not true in reality) to find that this is not the right one and then reload another handler? i guess this will be critical when # is huge like this. (i ran might 10 minutes with iometer on an iscsi target.) 16: 1330261 0 IO-APIC-level eth1, aic7xxx Ming