Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 12 Feb 2002 07:23:54 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 12 Feb 2002 07:23:45 -0500 Received: from unicef.org.yu ([194.247.200.148]:36621 "EHLO unicef.org.yu") by vger.kernel.org with ESMTP id ; Tue, 12 Feb 2002 07:23:29 -0500 Date: Tue, 12 Feb 2002 13:23:20 +0100 (CET) From: Davidovac Zoran To: Martin Josefsson cc: Subject: Re: Question about i820 chipset. In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org try to change slot perhaps one of your nic is sharing irq with mouse usb ide etc so change slot check with more /proc/interrupts On Tue, 12 Feb 2002, Martin Josefsson wrote: > Hi Alan, > > I have some small questions... > > Have you ever tried a motherboard with i820 chipset and two NIC's? > I have a Asus P3C-D here (dual pIII 800 with 256MB rimm) and a D-Link > DFE570-TX NIC (quad DECchip 21143 behind a DECchip 21152 pci bridge). > > The problem I'm seeing is extremely crappy pci performance. > With one of the NIC's active I see no real problems but when two NIC's are > active at the same time all hell breaks loose :( > > if I generate traffic out via 2 NIC's at the same time I'd expect to get > about 2 x 100Mbit/s but in reality I get 2 x 25Mbit/s with this > motherboard. and with 3 NIC's active I get about 3 x 15-20Mbit/s. > > I tried replacing the motherboard with an old SMP board based on the 440bx > chipset (cpus underclocked to 600MHz) and then I can easily get 3 x > 100Mbit/s with 25-30% cpu used in the machine. > > So my question is, have you ever seen such pci issues? I've tried all > BIOS settings I could find and a lot of diffrent kernels. I've also tried > the vanilla tulip-driver and the NAPI'fied one (which I have been helping > to test) and both show the exact same performanceproblems. > > I tried routing a lot of packets and it started dropping a lot of packets > when the cpu was only 75% used according to both vmstat and cyclesoak > (with an UP kernel). A profile shows that default_idle gets about 25% of > the time. I assume the kernel is waiting for the pci bus. > > And the last question, if you have the hardware, would you mind testing > something similar on the Asus A7M266-D? We've been thinking of getting a > few of these boards to replace the crappy i820 ones. > > I saw that you included a patch for MPS 1.4 in -pre9-ac1, was this the > same patch you were talking about earlier and does it work? > > /Martin > > Never argue with an idiot. They drag you down to their level, then beat you with experience. > > > - > 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/ > - 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/