From owner-freebsd-current@FreeBSD.ORG Tue Jul 8 23:51:39 2003 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B86C537B401; Tue, 8 Jul 2003 23:51:39 -0700 (PDT) Received: from stork.mail.pas.earthlink.net (stork.mail.pas.earthlink.net [207.217.120.188]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2673643FAF; Tue, 8 Jul 2003 23:51:39 -0700 (PDT) (envelope-from tlambert2@mindspring.com) Received: from user-38ldtos.dialup.mindspring.com ([209.86.247.28] helo=mindspring.com) by stork.mail.pas.earthlink.net with asmtp (SSLv3:RC4-MD5:128) (Exim 3.33 #1) id 19a8ni-00047G-00; Tue, 08 Jul 2003 23:51:38 -0700 Message-ID: <3F0BBB3B.EF2F5687@mindspring.com> Date: Tue, 08 Jul 2003 23:50:35 -0700 From: Terry Lambert X-Mailer: Mozilla 4.79 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: John Baldwin References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-ELNK-Trace: b1a02af9316fbb217a47c185c03b154d40683398e744b8a4798f7df152f5c3880b92daf839a6136a666fa475841a1c7a350badd9bab72f9c350badd9bab72f9c cc: Julian Elischer cc: FreeBSD current users Subject: Re: SMP and setrunnable()- scheduler 4bsd X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Jul 2003 06:51:40 -0000 John Baldwin wrote: > This is why HLT is not enabled in SMP by default (or at least was, > it may be turned on now). Given that the clock interrupts are > effectively broadcast to all CPU's one way or another for all > arch's (that I know of), you will never halt more than the interval > between clock ticks on any CPU. I thought that there was either a SPARC or Alpha box where Poul had to mess with the divider because they were delivered round robin, instead? -- Terry