From owner-cvs-all Wed Oct 13 21:10:44 1999 Delivered-To: cvs-all@freebsd.org Received: from duke.cs.duke.edu (duke.cs.duke.edu [152.3.140.1]) by hub.freebsd.org (Postfix) with ESMTP id 50C9314FDA; Wed, 13 Oct 1999 21:10:39 -0700 (PDT) (envelope-from gallatin@cs.duke.edu) Received: from grasshopper.cs.duke.edu (grasshopper.cs.duke.edu [152.3.145.30]) by duke.cs.duke.edu (8.9.1/8.9.1) with ESMTP id AAA18584; Thu, 14 Oct 1999 00:10:38 -0400 (EDT) Received: (from gallatin@localhost) by grasshopper.cs.duke.edu (8.9.3/8.9.1) id AAA56832; Thu, 14 Oct 1999 00:10:08 -0400 (EDT) (envelope-from gallatin@cs.duke.edu) From: Andrew Gallatin MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Date: Thu, 14 Oct 1999 00:10:08 -0400 (EDT) To: Bruce Evans Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/alpha/alpha clock.c interrupt.c In-Reply-To: References: <199910131918.MAA77949@freefall.freebsd.org> X-Mailer: VM 6.43 under 20.4 "Emerald" XEmacs Lucid Message-ID: <14341.21686.357856.650246@grasshopper.cs.duke.edu> Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk Bruce Evans writes: > > This mainly weakens the statclock to hide bugs. The most obvious bug is Yes. > that _BSD_CLOCKS_PER_SEC_ was broken on alphas (is 100 but needed to be > 1024 if hz was 1024). It seems to be still broken (is 100 but needs to > be 128 if stathz is 128). However, _BSD_CLOCKS_PER_SEC_ only affects > little-used userland interfaces (e.g, clock(3) and times(3)), so the main So little used that I really wasn't aware of them. Both _BSD_CLK_TCK_ and _BSD_CLOCKS_PER_SEC_ should be changed to 128 if stathz == 128, correct? > bug must be elsewhere. I think there are scaling bugs in schedcpu(), and > NetBSD has fixed them. These bugs may affect all systems with realstathz > != 100. There's a nice commit message detailing what was done at http://cvsweb.netbsd.org/cgi-bin/cvsweb.cgi/syssrc/sys/kern/kern_synch.c Maybe somebody who's familiar enough with schedcpu to make sense of it could take a look at what they've done.. Thanks, Drew ------------------------------------------------------------------------------ Andrew Gallatin, Sr Systems Programmer http://www.cs.duke.edu/~gallatin Duke University Email: gallatin@cs.duke.edu Department of Computer Science Phone: (919) 660-6590 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message