From owner-freebsd-smp Thu May 2 19: 4:29 2002 Delivered-To: freebsd-smp@freebsd.org Received: from 12-234-96-171.client.attbi.com (12-234-96-171.client.attbi.com [12.234.96.171]) by hub.freebsd.org (Postfix) with ESMTP id 88A3737B400; Thu, 2 May 2002 19:04:23 -0700 (PDT) Received: by 12-234-96-171.client.attbi.com (Postfix, from userid 1000) id ADC75A900; Thu, 2 May 2002 19:08:28 -0700 (PDT) Date: Thu, 2 May 2002 19:08:28 -0700 From: Jonathan Mini To: Terry Lambert Cc: John Baldwin , freebsd-smp@FreeBSD.org, Andrew Gallatin Subject: Re: hlt when idle? Message-ID: <20020502190828.D56560@stylus.haikugeek.com> References: <20020501151123.G30080@stylus.haikugeek.com> <20020502072949.C56560@stylus.haikugeek.com> <3CD170D4.48AEB353@mindspring.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <3CD170D4.48AEB353@mindspring.com>; from tlambert2@mindspring.com on Thu, May 02, 2002 at 10:01:08AM -0700 Sender: owner-freebsd-smp@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Terry Lambert [tlambert2@mindspring.com] wrote : > Jonathan Mini wrote: > > Maybe it was Sun? > > You are an ex-Be-geek. Maybe it was the BeBox and the two > processor PPC603e box from Apple? That crossed my mind first, but Be wired all of the interrupts to CPU 0 all the time, including the clock interrupt. It uses IPIs to let the other processors know of events like VM modifications and scheduling excess. > >From memory, in addition to using MEI instead of MESI cache > coherency because the CPUs were not built for SMP (the MEI > arbitration was done by putting contention hardware in place > of the L2 cache), interrupt routing was hardware round-robin. > > 8-). That is more detail than I know about the PPC-based BeBox. By the time I joined Be, we had already officially dropped support for them and were an x86 shop. -- Jonathan Mini http://www.haikugeek.com "He who is not aware of his ignorance will be only misled by his knowledge." -- Richard Whatley To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message