From owner-freebsd-current Fri Oct 6 14:55: 4 2000 Delivered-To: freebsd-current@freebsd.org Received: from pike.osd.bsdi.com (pike.osd.bsdi.com [204.216.28.222]) by hub.freebsd.org (Postfix) with ESMTP id AC0ED37B503; Fri, 6 Oct 2000 14:55:00 -0700 (PDT) Received: from laptop.baldwin.cx (ether.osd.bsdi.com [204.216.28.196]) by pike.osd.bsdi.com (8.11.0/8.9.3) with ESMTP id e96Ls5i54065; Fri, 6 Oct 2000 14:54:05 -0700 (PDT) (envelope-from jhb@FreeBSD.org) Message-ID: X-Mailer: XFMail 1.4.0 on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <20001007001336.A346@nn.kiev.ua> Date: Fri, 06 Oct 2000 14:54:22 -0700 (PDT) From: John Baldwin To: Valentin Nechayev Subject: RE: microuptime() went backwards: possible diagnosis Cc: phk@FreeBSD.org, freebsd-current@FreeBSD.org Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On 06-Oct-00 Valentin Nechayev wrote: > Following is partial dmesg output from 5.0(13)-CURRENT-20001002 kernel > with advanced debugging prints: The problem was that the interrupt threads for the clk interrupt introduced enough latency that occasionally (mostly during a heavy load of interrupts) tc_windup() wasn't called soon enough to update the timecounter. Making clock interrupts not be threaded fixes this problem. -- John Baldwin -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message