Date: Mon, 16 Sep 2002 12:31:39 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Harti Brandt <brandt@fokus.gmd.de> Cc: Bruce Evans <bde@zeta.org.au>, Josef Karthauser <joe@FreeBSD.ORG>, "David O'Brien" <obrien@FreeBSD.ORG>, cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/kern kern_timeout.c Message-ID: <13968.1032172299@critter.freebsd.dk> In-Reply-To: Your message of "Mon, 16 Sep 2002 12:29:51 %2B0200." <20020916122355.N92332-100000@beagle.fokus.gmd.de>
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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
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