From owner-freebsd-alpha Mon Jan 11 23:44:15 1999 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id XAA11830 for freebsd-alpha-outgoing; Mon, 11 Jan 1999 23:44:15 -0800 (PST) (envelope-from owner-freebsd-alpha@FreeBSD.ORG) Received: from feral-gw.feral.com (feral.com [192.67.166.1]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id XAA11822 for ; Mon, 11 Jan 1999 23:44:14 -0800 (PST) (envelope-from mjacob@feral.com) Received: from localhost (mjacob@localhost) by feral-gw.feral.com (8.8.7/8.8.7) with ESMTP id XAA22035; Mon, 11 Jan 1999 23:43:09 -0800 Date: Mon, 11 Jan 1999 23:43:08 -0800 (PST) From: Matthew Jacob X-Sender: mjacob@feral-gw Reply-To: mjacob@feral.com To: Mike Smith cc: Hidetoshi Shimokawa , alpha@FreeBSD.ORG Subject: Re: complete lockup under large I/O? In-Reply-To: <199901120708.XAA01319@dingo.cdrom.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-alpha@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Mon, 11 Jan 1999, Mike Smith wrote: > > > > Well, I tried with the BRK option but it still hung and wouldn't drop into > > DDB. > > Can I assume that you don't have access to this system, or can't > otherwise get video onto it? > > ... > > So, clearly some other evil deadlock has occurred. > > Yup. Nothing in your output is ringing any bells, unfortunately. 8( No, it's a PC164 in my office. When I say it still won't drop into DDB, I mean it *does* except when this deadlock happens. BTW, I found out where it happens: lmdd if=/dev/rcc0c bs=1048k (i.e., just over one megabyte). Something broken is occurring here which I haven't time to trace today. The maxphys limitation seems to be happening as 1024K dd sizes get limited to 64k transfers, so it may be some other page lockdown foolishness. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message