From owner-cvs-all Mon Sep 16 3:31:50 2002 Delivered-To: cvs-all@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4D0A237B400; Mon, 16 Sep 2002 03:31:49 -0700 (PDT) Received: from critter.freebsd.dk (critter.freebsd.dk [212.242.86.163]) by mx1.FreeBSD.org (Postfix) with ESMTP id 75E7843E4A; Mon, 16 Sep 2002 03:31:48 -0700 (PDT) (envelope-from phk@critter.freebsd.dk) Received: from critter.freebsd.dk (localhost [127.0.0.1]) by critter.freebsd.dk (8.12.6/8.12.6) with ESMTP id g8GAVd0B013969; Mon, 16 Sep 2002 12:31:40 +0200 (CEST) (envelope-from phk@critter.freebsd.dk) To: Harti Brandt Cc: Bruce Evans , Josef Karthauser , "David O'Brien" , cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/kern kern_timeout.c In-Reply-To: Your message of "Mon, 16 Sep 2002 12:29:51 +0200." <20020916122355.N92332-100000@beagle.fokus.gmd.de> Date: Mon, 16 Sep 2002 12:31:39 +0200 Message-ID: <13968.1032172299@critter.freebsd.dk> From: Poul-Henning Kamp Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG In message <20020916122355.N92332-100000@beagle.fokus.gmd.de>, Harti Brandt wri tes: >In case of the xl driver it is a problem with DELAY(). One xl_mii_readreg >needs 184 DELAY(1) calls, each of which takes around 9usecs. The mii_tick >needs several readregs. Just for testing I have converted all these DELAYs >to use busy wait on the TSC. This cuts down the readreg() time to >350usecs! I have a point on my TODO list about improving DELAY(), but nobody has picked it up yet. -- 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 cvs-all" in the body of the message