From owner-freebsd-smp Sat Mar 30 6:17: 8 2002 Delivered-To: freebsd-smp@freebsd.org Received: from critter.freebsd.dk (critter.freebsd.dk [212.242.86.163]) by hub.freebsd.org (Postfix) with ESMTP id A5DAA37B41B; Sat, 30 Mar 2002 06:17:04 -0800 (PST) Received: from critter.freebsd.dk (localhost [127.0.0.1]) by critter.freebsd.dk (8.12.2/8.12.2) with ESMTP id g2UEEqe7077417; Sat, 30 Mar 2002 15:14:52 +0100 (CET) (envelope-from phk@critter.freebsd.dk) Cc: Robert Watson , Matthew Dillon , John Baldwin , freebsd-smp@FreeBSD.ORG Subject: Re: Syscall contention tests return, userret() bugs/issues. In-Reply-To: Your message of "Sat, 30 Mar 2002 15:10:20 +0100." <76368.1017497420@critter.freebsd.dk> Date: Sat, 30 Mar 2002 15:14:52 +0100 Message-ID: <77416.1017497692@critter.freebsd.dk> From: Poul-Henning Kamp 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 In message <76368.1017497420@critter.freebsd.dk>, Poul-Henning Kamp writes: >The practical guide to execute #3 should be: > > A = Time reference code > B = Time modified code > C = Time reference code > D = Time modified code > >Unless both A and C are lower than both B and D it will take a lot >of carefully controlled test-runs to prove that there is a statistically >significant improvement (standard deviations and all that...) And of course I get the sign wrong: Unless both A and C are _higher_ than both B and D... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message