Date: Wed, 21 Jul 2004 10:18:53 -0700 From: Ted Faber <faber@ISI.EDU> To: Nate Lawson <nate@root.org> Cc: freebsd-acpi@freebsd.org Subject: Re: Dell Latitude 610 CPU clock rate degrading (debug info included) Message-ID: <20040721171853.GB45921@pun.isi.edu> In-Reply-To: <40FD6BEB.4060102@root.org> References: <20040720165016.GA35412@pun.isi.edu> <40FD6BEB.4060102@root.org>
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--2B/JsCI69OhZNC5r Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, Jul 20, 2004 at 12:00:59PM -0700, Nate Lawson wrote: > Ted Faber wrote: > >My Dell Latatude 610 is having its clock rate go from 1000 Mhz to 733 > >Mhz under -CURRENT that was cvsupped and installed yesterday. I'm > >honestly not sure how long this has been happening, since I only got the > >clock speed monitor (the one that runs under gkrellm) hooked up a couple > >weeks ago. I hooked it up because the machine seemed slow. It had been > >happening for a couple weeks at least. > > > >The rate seems to change after using the CPU hard for a while - a big > >compile, like make buildworld seems to do it, though even a few minutes > >of compilation seems sufficient. > > > >When the CPU speed changes I get a message in the logs saying > > > >cpu0: Performance states changed > > > >The state never seems to change back to a high performance one. I've > >configured the BIOS not to do power management with the AC connected, > >and this happens with the AC connected. > > This transition is being done by the BIOS for passive cooling. We can't > control it until the cpufreq driver is committed. When the system gets > hot, the BIOS steps the processor down to 733 mhz but the timecounters have > no way of knowing it happened. Thanks for the info. If you've got a list of people to ping when the cpufreq driver appears, put me on it. I'll be watching for the HEADSUP in any case. > > >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). Thanks again for your quick response. -- Ted Faber http://www.isi.edu/~faber PGP: http://www.isi.edu/~faber/pubkeys.asc Unexpected attachment on this mail? See http://www.isi.edu/~faber/FAQ.html#SIG --2B/JsCI69OhZNC5r Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFA/qV9aUz3f+Zf+XsRAqumAKD1beqQU66u4HOQ1bOZny0AqbHe2QCgmfY4 rY56EkotXoIqWoLwDrIgRC8= =isyl -----END PGP SIGNATURE----- --2B/JsCI69OhZNC5r--
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