Hi Hal, All,
Starting the day here :)
On 31/01/2017 05:53, Hal Murray wrote:
$ cat /proc/cmdline
root=UUID=48d99649-90b2-4dc6-be05-5ca3858579a1 ro
[email protected] said:
That sounds right for getting into OpenFirware - but for what we're digging
into you shouldn't need to putz with it.
It looks like the kernel code is getting the clock frequency from Open
Firmware. If that's off, it could lead to this sort of problem.
Yes - that's one possible scenario.
The Intel version of Linux calibrates the TSC against one of the other clocks
that is well specified, or at least constant in practice.
If I recall correctly the PowerPC definition requires the timebase in a
PPC chip to be of constant frequency irrespective of power saving, clock
modulation to minimize EMI and other such - so they're normally pretty
well behaved.
I realised overnight, and I apologise - I should have asked you to run
$ uname -a
and
$ cat /etc/issue
as the /proc/cmdline entry didn't contain the kernel version - something
we will definitely need.
One other query if I may - I think you've already confirmed this
behaviour across a couple of physical machines ? Just want to rule out
a single errant bit of hardware - unlikely but not unknown :)
Cheers,
Hugh
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