From owner-freebsd-smp Wed Feb 27 12:16:31 2002 Delivered-To: freebsd-smp@freebsd.org Received: from rwcrmhc52.attbi.com (rwcrmhc52.attbi.com [216.148.227.88]) by hub.freebsd.org (Postfix) with ESMTP id 6029937B43B; Wed, 27 Feb 2002 12:16:06 -0800 (PST) Received: from gateway.posi.net ([12.236.90.177]) by rwcrmhc52.attbi.com (InterMail vM.4.01.03.27 201-229-121-127-20010626) with ESMTP id <20020227201605.YEZS1147.rwcrmhc52.attbi.com@gateway.posi.net>; Wed, 27 Feb 2002 20:16:05 +0000 Received: from localhost (kbyanc@localhost) by gateway.posi.net (8.11.6/8.11.6) with ESMTP id g1RKG0W08399; Wed, 27 Feb 2002 12:16:03 -0800 (PST) (envelope-from kbyanc@posi.net) X-Authentication-Warning: gateway.posi.net: kbyanc owned process doing -bs Date: Wed, 27 Feb 2002 12:16:00 -0800 (PST) From: Kelly Yancey To: Bruce Evans Cc: Bob Van Valzah , Robert Watson , Jorge Aldana , Garance A Drosihn , Subject: Re: Performance vs. Stable In-Reply-To: <20020227220832.V48463-100000@gamplex.bde.org> Message-ID: <20020227121320.X8086-100000@gateway.posi.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII 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 On Wed, 27 Feb 2002, Bruce Evans wrote: > > > > Processor, Processes - factor slower than the best > > -------------------------------------------------- > > I think you are misinterpreting them. The non-starrd results are > absolute times. E.g., they say that the "null" syscall takes 6.1 usec > in 4.5-S and 6.1 usec in -current. This is about right. The "null" > syscall is actually a write of 1 byte to /dev/null. File i/o has been > been extensively pessimized in -current using locking. This only > matters much for small i/o's, which is exactly what the benchmark > tests. The pessimization is normally reduced a little for device files > by using devfs. > I know I am going out on a limb to doubt you, but are you sure? The chart header (as quoted above) sure seems to imply that the starred times are absolute and all of the others are relative comparisons. As such, I was quite impressed by how well -current appears to be performing compared to -stable given how little optimization has been done so far. Kelly kbyanc@{posi.net,FreeBSD.org} To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message