From owner-freebsd-alpha Tue Apr 24 19: 6:29 2001 Delivered-To: freebsd-alpha@freebsd.org Received: from duke.cs.duke.edu (duke.cs.duke.edu [152.3.140.1]) by hub.freebsd.org (Postfix) with ESMTP id 05A6237B424; Tue, 24 Apr 2001 19:06:26 -0700 (PDT) (envelope-from gallatin@cs.duke.edu) Received: from grasshopper.cs.duke.edu (grasshopper.cs.duke.edu [152.3.145.30]) by duke.cs.duke.edu (8.9.3/8.9.3) with ESMTP id WAA10058; Tue, 24 Apr 2001 22:06:25 -0400 (EDT) Received: (from gallatin@localhost) by grasshopper.cs.duke.edu (8.11.3/8.9.1) id f3P25tJ34961; Tue, 24 Apr 2001 22:05:55 -0400 (EDT) (envelope-from gallatin@cs.duke.edu) From: Andrew Gallatin MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15078.12547.396385.16565@grasshopper.cs.duke.edu> Date: Tue, 24 Apr 2001 22:05:55 -0400 (EDT) To: John Baldwin Cc: alpha@FreeBSD.ORG Subject: Re: Preemption on by default In-Reply-To: References: X-Mailer: VM 6.75 under 21.1 (patch 12) "Channel Islands" XEmacs Lucid Sender: owner-freebsd-alpha@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org John Baldwin writes: > Does anyone have any objections to removing the PREEMPTION kernel option and > just turning it on by default now for the alpha arch? IIRC, the only machine > that still had problems with preemption was the 4100, and the 4100 here at the > office is happily running a SMP preemptive kernel at the moment. That sounds fine to me. > As far as SMP in general is concerned, I think that the top of the tree should > work somewhat with the exception that accounting might be rather screwed up > (and thus scheduling might be a little wacky, but not unusable). I'm currently > ripping up large portions of the kernel SMP code to make some of it more > machine independent among other things. These changes include changing the way > we handle clock interrupts on SMP systems and will hopefully improve if not fix > the current accounting problems with alpha SMP. Woo-hoo! Nice work, John. Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message