Date: Tue, 12 Dec 2000 17:45:22 +0100 From: Andrea Campi <andrea@webcom.it> To: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/kern kern_ktr.c Message-ID: <20001212174522.C440@webcom.it> In-Reply-To: <XFMail.001212083931.jhb@FreeBSD.org>; from jhb@FreeBSD.org on Tue, Dec 12, 2000 at 08:39:31AM -0800 References: <Pine.BSF.4.21.0012130124150.585-100000@besplex.bde.org> <XFMail.001212083931.jhb@FreeBSD.org>
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> > Mutex operations actually resulted only on the i386 arch, only if the
> > i8254 timecounter was used (i.e., mainly on pre-PCI pre-Pentium
> > systems). Both the alpha and the i386 have an i8254 timecounter which
> > should use mutex operations, but the alpha version was copied from
> > the i386 version before mutex operations were added to the latter,
> > and it has rotted.
>
> It would crash both my dual P3-600 and my P3-700 laptop, so it wasn't limited
> to just pre-PCI. :-/ Granted, I have apm turned on (even though it doesn't
> work) for my laptop, which is why the TSC isn't used there, and we don't use
> the TSC on SMP systems at all. The alpha code probably does need to have
> clock_lock added to it.
By the way, may I ask exactly how and why should one use:
CLK_USE_I8254_CALIBRATION
and/or
CLK_USE_TSC_CALIBRATION
I could find no description or hint whatsoever...
--
I believe the technical term is "Oops!"
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