Re: [discuss] Re: [PATCH] x86_64: Test patch for ATI/Nvidia timer problems

[Pavel Machek]

Hi!

> On Saturday 26 November 2005 15:20, Andi Kleen wrote:
> > Everybody who saw timing problems with ATI IXP based boards with x86-64
> > or some Nvidia NForce4 boards please test this patch. Please send
> > success/failure to me.
> 
> I try to give your patch a try on the ATI based MSI Megabook S270, today - 
> however even with the workaround of "noapic" I had timer drift on resuem from 
> ram if the cpu was scaled to a lower frequency when it was suspended.
> 
> The k8 cpufreq code failed to assert the current frequency and thus assumed a 
> wrong one:
> 
> Restarting tasks...<3>powernow-k8: ignoring illegal change in lo freq table-0 
> to 0x0
> powernow-k8: transition frequency failed
>  done
> 
> Also my ACPI table only has two frequency entries, 800000 and 1600000 MHz - I 
> wonder if one could rework the powernow-k8 driver to interpolate values in 
> between to get smoother adaption of the frequency?

Unfortunately, hardware can not go to anything between.
								Pavel
-- 
Thanks, Sharp!
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