Date: Mon, 24 Nov 2003 13:49:09 -0800 (PST) From: Nate Lawson <nate@root.org> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: John Polstra <jdp@polstra.com> Subject: Re: PII SMP system hangs during boot with ACPI enabled Message-ID: <20031124134735.O87605@root.org> In-Reply-To: <23528.1069709458@critter.freebsd.dk> References: <23528.1069709458@critter.freebsd.dk>
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On Mon, 24 Nov 2003, Poul-Henning Kamp wrote: > In message <XFMail.20031124130939.jdp@polstra.com>, John Polstra writes: > >On 24-Nov-2003 Nate Lawson wrote: > >> It's a long shot, but what about setting kern.timecounter.hardware to > >> i8254. It appears your ACPI timer is bad. The reason why I suggest this > >> is that it seems like interrupts are being lost. > > > >I put kern.timecounter.hardware="i8254" into /boot/loader.conf, but > >it didn't make any difference. Are you sure it even works from > >loader.conf? From the sources it looks like this is a sysctl rather > >than a tunable. I could change it to a tunable, though, if you > >think it's worthwhile. > > It would be rather complicated to make it a tunable. Far easier to > go into the ACPI timecounter and just give it a negative quality, > that will disable it. > > I'm not sure why Nate think this will change anything with respect > to interrupts, but I pressume he knows what he's talking about. Some ACPI timecounters on old systems would hang on a read from the register and so moving to i8254 would help if it was being used. But farther down, I see that he was already using TSC so it won't make a difference. -Nate
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