From owner-freebsd-hackers Sun Dec 12 15:30:21 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from overcee.netplex.com.au (overcee.netplex.com.au [202.12.86.7]) by hub.freebsd.org (Postfix) with ESMTP id D1EA114E27 for ; Sun, 12 Dec 1999 15:30:17 -0800 (PST) (envelope-from peter@netplex.com.au) Received: from netplex.com.au (localhost [127.0.0.1]) by overcee.netplex.com.au (Postfix) with ESMTP id EE2921CA0; Mon, 13 Dec 1999 07:30:13 +0800 (WST) (envelope-from peter@netplex.com.au) X-Mailer: exmh version 2.1.1 10/15/1999 To: mauzi@poli.hu Cc: Julian Elischer , freebsd-hackers@FreeBSD.ORG Subject: Re: silo overflows In-Reply-To: Message from Julian Elischer of "Sun, 12 Dec 1999 15:06:54 PST." Date: Mon, 13 Dec 1999 07:30:13 +0800 From: Peter Wemm Message-Id: <19991212233013.EE2921CA0@overcee.netplex.com.au> Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Julian Elischer wrote: > > > On Sun, 12 Dec 1999, Gergely EGERVARY wrote: > > > > what kind of disk to you have? and the chipset? (this may seem irrelevant > > > but misconfigured DMA devices can block the cpu for long enough to cause > > > this sort of thing in some cases). ALSO check systat -vmstat while this > > > is happenning and check that you don't have a source of spurious > > > interrupts. > > > > > > Julian > > > > intel 440bx chipset (abit-bh6 mainboard) > > quantum cx13.0a ata4 disk > > > > actually i don't see any spurious interrupts :) > > (that had happenned to me) > > If you can get the disk working right it may even solve the silo problem. > (it did for me) > It turned out that the disk system was blocking the PCI bus during DMA > > Julian For what it's worth, your problem is a wdc driver and/or a configuration problem. outback# dd if=/dev/ad0s1b of=/dev/null bs=256k count=512 512+0 records in 512+0 records out 134217728 bytes transferred in 6.868476 secs (19541122 bytes/sec) That's a 440bx and a quantum cx drive (slightly smaller, 10MB), but under -current. You have remembered to set flags 0xa0ffa0ff on the wdc controller right? Cheers, -Peter To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message