From owner-freebsd-current Thu Feb 4 19:06:18 1999 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id TAA12757 for freebsd-current-outgoing; Thu, 4 Feb 1999 19:06:18 -0800 (PST) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from iquest3.iquest.net (iquest3.iquest.net [209.43.20.203]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id TAA12747 for ; Thu, 4 Feb 1999 19:06:11 -0800 (PST) (envelope-from toor@y.dyson.net) Received: (qmail 27075 invoked from network); 5 Feb 1999 03:05:30 -0000 Received: from dyson.iquest.net (HELO y.dyson.net) (198.70.144.127) by iquest3.iquest.net with SMTP; 5 Feb 1999 03:05:30 -0000 Received: (from root@localhost) by y.dyson.net (8.9.1/8.9.1) id WAA00818; Thu, 4 Feb 1999 22:05:28 -0500 (EST) Message-Id: <199902050305.WAA00818@y.dyson.net> Subject: Re: aio_read panics SMP kernel In-Reply-To: <199902031932.OAA01903@dean.pc.sas.com> from Brian Dean at "Feb 3, 99 02:32:24 pm" To: brdean@unx.sas.com (Brian Dean) Date: Thu, 4 Feb 1999 22:05:28 -0500 (EST) Cc: freebsd-current@FreeBSD.ORG From: "John S. Dyson" Reply-To: dyson@iquest.net X-Mailer: ELM [version 2.4ME+ PL38 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Brian Dean said: > > I'm using a dual 350MHz Dell Precision 410 with 4.0-19990130-SNAP (SMP > enabled) to prototype a program that uses asynchronous read and write > (aio_read() and aio_write()), and found that the following simple and > not very useful program (it's for demonstration purposes only!) causes > the system to do one of three things: > The VM code needs to be upgraded to support proper threading and shared address space operations under SMP. That is a major missing feature, and probably something that should be higher priority than it currently is. I have experimental work to support it (and alot of other interesting things), but it will probably be quite a while before those who are currently working on the code will be able to add the capability. -- John | Never try to teach a pig to sing, dyson@iquest.net | it makes one look stupid jdyson@nc.com | and it irritates the pig. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message