From owner-freebsd-bugs@FreeBSD.ORG Tue Jun 3 14:10:16 2003 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 61D7237B401 for ; Tue, 3 Jun 2003 14:10:15 -0700 (PDT) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0B0E843FA3 for ; Tue, 3 Jun 2003 14:10:15 -0700 (PDT) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) by freefall.freebsd.org (8.12.9/8.12.9) with ESMTP id h53LAEUp068007 for ; Tue, 3 Jun 2003 14:10:14 -0700 (PDT) (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.12.9/8.12.9/Submit) id h53LAEtA068006; Tue, 3 Jun 2003 14:10:14 -0700 (PDT) Date: Tue, 3 Jun 2003 14:10:14 -0700 (PDT) Message-Id: <200306032110.h53LAEtA068006@freefall.freebsd.org> To: freebsd-bugs@FreeBSD.org From: gson@nominum.com (Andreas Gustafsson) Subject: Re: misc/34596: slow gettimeofday in FreeBSD 4.5 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: Andreas Gustafsson List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 03 Jun 2003 21:10:16 -0000 The following reply was made to PR misc/34596; it has been noted by GNATS. From: gson@nominum.com (Andreas Gustafsson) To: freebsd-gnats-submit@FreeBSD.org, jason@carrollgroup.org Cc: Subject: Re: misc/34596: slow gettimeofday in FreeBSD 4.5 Date: Tue, 3 Jun 2003 14:01:36 -0700 (PDT) gettimeofday() is still really slow in FreeBSD 4.8-STABLE. Some numbers from the test program submitted with misc/34596: FreeBSD 4.8, single Intel Xeon 2.8 GHz delta: 5s 59701us NetBSD 1.6L, dual AMD Athlon MP 1800+ delta: 2s 801360us NetBSD 1.6T, single Transmeta Crusoe 600 MHz delta: 2s 582755us Linux 2.4.9-31smp, dual AMD Athlon MP 1900+ delta: 0s 247116us That's more than 5 microseconds on a 2.8 GHz processor, or more than 14000 clock cycles per call. Other info: $ grep -i time /var/run/dmesg.boot Timecounter "i8254" frequency 1193182 Hz $ sysctl kern.timecounter kern.timecounter.method: 0 kern.timecounter.hardware: i8254 -- Andreas Gustafsson, gson@nominum.com