Re: many lost ticks, clock drifts problems also with debian smp kernel?
On Fri, Dec 09, 2005 at 06:39:26AM -0500, mikepolniak wrote:
> On 10:36 Fri 09 Dec , remi.delmas.3000@free.fr wrote:
> >
> >
> > Hi,
> >
> > I have a machine with an AMD64 x2 4800+ mounted on an asus A8V Deluxe. I have
> > experienced massive clock drift problems with smp kernels from the fedora core
> > 4 x86_64 distribution, also with the newer 2.6.14.3 kernel from kernel.org:
> >
> > ----------
> > dmesg :
> >
> > Losing some ticks... checking if CPU frequency changed.
> > warning: many lost ticks.
> > Your time source seems to be instable or some driver is hogging interupts
> > rip 0x435036
> > ---------------
> >
> > I have tried the pci=routeirq, acpi=off, noapic, nolapic, no_timer_check,
> > no_tsc... bootparams without any real succes, my system clock keeps on drifting
> > away faster and faster after the system has been up for some time.
> >
> > My question to the list is :
> >
> > Are the debian amd64-k8-smp kernels also subject to this problem?
> >
> This is a kernel problem with SMP having unsynced TSC's running at
> different freqs, supposedly fixed in kernel 2.6.14. Before 2.6.14 i
> needed to boot with pci=noacpi and clock=pmtmr to solve the 'lost
> 'ticks'.
>
> A Debian kernel won't change anything. assuming you have a similar config
> (e.g. HPET_TIMER=y PM_TIMER=y). You may want to post this on the LKML.
This must be specific to some chipsets as I do not have this problem on
my SMP system running Debian kernel 2.6.12-whatever.
a
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