Date: Wed, 13 Dec 2000 05:37:17 -0800 From: Mike Smith <msmith@freebsd.org> To: Bruce Evans <bde@zeta.org.au> Cc: John Baldwin <jhb@FreeBSD.org>, cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org Subject: Re: cvs commit: src/sys/kern kern_ktr.c Message-ID: <200012131337.eBDDbH308681@mass.osd.bsdi.com> In-Reply-To: Your message of "Thu, 14 Dec 2000 00:14:30 %2B1100." <Pine.BSF.4.21.0012140006070.2229-100000@besplex.bde.org>
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> On Tue, 12 Dec 2000, John Baldwin wrote:
>
> > On 12-Dec-00 Bruce Evans wrote:
> > > 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)...
> >
> > It would crash both my dual P3-600 and my P3-700 laptop, so it wasn't limited
> > to just pre-PCI. :-/ ...
>
> The PIIX4 timecounter is used on many PCI systems. I was over-optimistic
> in hoping that most post-Pentium PCI systems have one. What chipsets do
> your systems have?
Both his systems have the ACPI timecounter hardware. We don't use it
aggressively enough yet. We also need some tweaks to determine whether
we can trust it to be a synchronous counter (the PIIX4 can't be trusted,
but others might be).
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
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