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SubjectRe: [PATCH] x86-64 highres/dyntick support
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Alistair,

On Mon, 2007-05-14 at 02:17 +0100, Alistair John Strachan wrote:
> I've noticed a few problems with this patch series, which I manually (without
> difficulty) ported to 2.6.22-rc1.

There are a couple of fixups pending. I'm going to push out a new queue
today.

> Only 195 timer interrupts? I only see this on an AMD Opteron, it doesn't occur
> on an Intel Core 2 Duo. Mainline reports this counter regularly increasing
> with or without the acpi_pm clocksource loaded.

We stop the PIT when we switch to the local APICs. On your Intel box you
might have deeper C-states which switch the system back to broadcast
mode via PIT.

> Secondly, /proc/cpuinfo seems to be broken:
>
> alistair@damocles:~$ cat /proc/cpuinfo | grep MHz
> cpu MHz : 210779.550
> cpu MHz : 210779.550
>
> Unless my CPU is just under 80 times faster than it used to be, these numbers
> are incorrect. I expect 2700.50, or something similar. cpufreq isn't compiled
> in.

Hmm. It seems the new TSC calibration routine is hosed.

> Finally, and possibly related, the dmesg timestamps seem to be totally broken.
> Apparently my machine booted in less than 1 second, with the last messages
> as:
>
> [ 0.607862] bridge: topology change detected, propagating
> [ 0.607862] bridge: port 2(lan-sky) entering forwarding state
> [ 0.830472] Linux agpgart interface v0.102 (c) Dave Jones

Hey, you have a really fast box :)

tglx


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