From owner-freebsd-smp Fri Nov 5 10:50:34 1999 Delivered-To: freebsd-smp@freebsd.org Received: from horst.bfd.com (horst.bfd.com [12.9.219.10]) by hub.freebsd.org (Postfix) with ESMTP id 643F815610 for ; Fri, 5 Nov 1999 10:50:30 -0800 (PST) (envelope-from ejs@bfd.com) Received: from HARLIE.bfd.com (bastion.bfd.com [12.9.219.14]) by horst.bfd.com (8.9.3/8.9.3) with ESMTP id KAA27114; Fri, 5 Nov 1999 10:47:30 -0800 (PST) (envelope-from ejs@bfd.com) Date: Fri, 5 Nov 1999 10:47:30 -0800 (PST) From: "Eric J. Schwertfeger" To: "Rodney W. Grimes" Cc: Adam Strohl , "Daniel O'Connor" , Darryl Okahata , freebsd-smp@FreeBSD.ORG Subject: Re: Dual Celeron + FreeBSD? In-Reply-To: <199911051829.KAA57885@gndrsh.dnsmgr.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-smp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Fri, 5 Nov 1999, Rodney W. Grimes wrote: > > I've done make buildworld's on both my dual Celeron and my dual PPro (the > > ones with 512K cache). The difference between single and dual celeron is > > minimal, about 10%. On the dual PPro machine, the speed improvement, > > using the same disk subsystem, was 80%. Yes, on processes that aren't > > memory intensive, dual Celerons rock. In fact, on most things, I see > > closer to 40-50% improvement with dual Celerons, the make buildworld is > > rather memory intensive. > > Actually make buildworld is disk intensive... SMP plain out does not > seem to help it much, unless of course you run a non-standard make > world with -pipe, which then does make the memory bandwidth demand > higher, and if both sides of the pipe just happen to get split accross > 2 processors it causes the small cache to be ineffective and the memory > system to be a major stall point. Can't remember if I was using -pipe, this was a default 3.2 install, except that I'm pretty sure I was using soft updates. I may have been, because the HD lights would only flicker every few seconds, so it definitely wasn't disk bound. I had /usr/src, /usr/obj, and /tmp all on seperate spindles (each on a 4GB 7200 RPM SCSI drive). Given other people's comments, I'd really expect more than the 10% that I saw. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message