Date: Sat, 31 Aug 2002 11:46:13 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Bruce Evans <bde@zeta.org.au> Cc: hardware@FreeBSD.ORG Subject: Re: PCI latency timer vs interrupt latency and ISA bus latency Message-ID: <39131.1030787173@critter.freebsd.dk> In-Reply-To: Your message of "Sat, 31 Aug 2002 16:48:20 %2B1000." <20020831160511.O3960-100000@gamplex.bde.org>
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In message <20020831160511.O3960-100000@gamplex.bde.org>, Bruce Evans writes: >Debugging of interrupt latency caused by critical_enter() showed that >DELAY(2) sometimes delayed for 170 or more usec for an Athlon1600 CPU DELAY(2) should not use i8254 when better alternatives exist. We may not want to deal with the TSC calibration issue, but both the ACPI timer and the APIC timer in the CPU would be good candidates. -- 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 freebsd-hardware" in the body of the message
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