Messages in this thread | | | Subject | Re: [PATCH] x86-64: Fix bad assumption that dualcore cpus have synced TSCs | From | john stultz <> | Date | Mon, 10 Oct 2005 11:03:24 -0700 |
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On Sat, 2005-10-08 at 14:11 +0400, Vladimir B. Savkin wrote: > On Fri, Oct 07, 2005 at 02:31:46PM +0200, Andi Kleen wrote: > > On Friday 07 October 2005 14:26, Vladimir B. Savkin wrote: > > > On Mon, Sep 19, 2005 at 12:16:43PM -0700, john stultz wrote: > > > > Andrew, > > > > This patch should resolve the issue seen in bugme bug #5105, where it > > > > is assumed that dualcore x86_64 systems have synced TSCs. This is not > > > > the case, and alternate timesources should be used instead. > > > > > > > > For more details, see: > > > > http://bugzilla.kernel.org/show_bug.cgi?id=5105 > > > > > > I too have a box that shows the symptoms from bugzilla entry above. > > > The system is Asus A8V Deluxe MB with > > > "AMD Athlon(tm) 64 X2 Dual Core Processor 3800+". > > > > > > The patch below did not fix the problem, while "idle=poll" did. > > > Hope this helps, dmesg attached. > > > > Are you running the latest BIOS? > > Just upgraded to the lastest BIOS (revision 1014), nothing changed. > Only with "idle=poll" timers run normally.
>From your dmesg, it appears that there are no other timesources other then the TSC available on your hardware. So I'm guessing idle=poll is keeping the CPUs from halting the TSC and keeping them synched.
I would think that the ACPI PM timer would be supported, but I don't see anything about it in your dmesg. Could you make sure it is properly configured in?
thanks -john
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