Date: Wed, 21 Jul 2004 11:34:38 -0700 From: Nate Lawson <nate@root.org> To: Ted Faber <faber@ISI.EDU> Cc: freebsd-acpi@freebsd.org Subject: Re: Dell Latitude 610 CPU clock rate degrading (debug info included) Message-ID: <40FEB73E.7020102@root.org> In-Reply-To: <20040721171853.GB45921@pun.isi.edu> References: <20040720165016.GA35412@pun.isi.edu> <40FD6BEB.4060102@root.org> <20040721171853.GB45921@pun.isi.edu>
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Ted Faber wrote: > On Tue, Jul 20, 2004 at 12:00:59PM -0700, Nate Lawson wrote: > >>Ted Faber wrote: >>>I tried booting without ACPI, but my time of day clock ran consistenty >>>slow - which might mean that the same degredation was occurring without >>>the OS readjusting for it. In any case it wasn't clear that no ACPI >>>helped. >> >>Same problem. What timecounter are you using? Switching away from TSC >>would help this. > > With ACPI there's no clock skew problem, so that's how I've been > running. Just for my information, how might I switch timecounters? (It > sounds like it won't solve the problem to switch away from ACPI, but I'm > curious). When running without ACPI, you should use the i8254 timecounter. Switch it with this command (or put it in /etc/sysctl.conf): sysctl kern.timecounter.hardware="i8254" -- -Nate
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