From owner-freebsd-current Wed Sep 10 05:59:46 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id FAA29416 for current-outgoing; Wed, 10 Sep 1997 05:59:46 -0700 (PDT) Received: from smtp.algonet.se (angel.algonet.se [194.213.74.112]) by hub.freebsd.org (8.8.7/8.8.7) with SMTP id FAA29409 for ; Wed, 10 Sep 1997 05:59:42 -0700 (PDT) Received: (qmail 8804 invoked from network); 10 Sep 1997 12:59:39 -0000 Received: from kairos.algonet.se (HELO kairos) (mal@194.213.74.18) by angel.algonet.se with SMTP; 10 Sep 1997 12:59:39 -0000 Received: (mal@localhost) by kairos (SMI-8.6/8.6.12) id OAA02564; Wed, 10 Sep 1997 14:59:38 +0200 Date: Wed, 10 Sep 1997 14:59:38 +0200 Message-Id: <199709101259.OAA02564@kairos> From: Mats Lofkvist To: se@freebsd.org CC: current@freebsd.org In-reply-to: <19970909231006.58788@mi.uni-koeln.de> (message from Stefan Esser on Tue, 9 Sep 1997 23:10:06 +0200) Subject: Re: lousy disk perf. under cpu load (was IDE vs SCSI) Sender: owner-freebsd-current@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Hmmm, you got all your PCI disk and LAN cards on IRQ 10, which means there are three cards sharing interrupts. The VGA is on IRQ 11, and it should not really cause interrupts ... Could you try to assign different IRQs to fxp0, ncr0 and ahc0 ? Shared interrupts should just work, and there should not be a measurable impact on performance, but this is the only thing that seems special in your system. Regards, STefan Reassigning interrupts doesn't seem to be as easy as I hoped :-( I have an Intel Providence motherboard with the ahc and fxp builtin (on pci) and an separate ncr for the narrow devices. I haven't been able to figure out how to change the interrupts, can't find anything in the bios letting me set them explicitly. (Setting plug-n-play to "bios" mode only lets me reserve irq's used by non-pnp cards, not reassign anything on pci. With pnp in the "pnp os" mode nothing can be changed.) Any ideas? _ Mats Lofkvist mal@algonet.se