Hi,
On 17-01-18 09:31, Mika Kuoppala wrote:
Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
Quoting Mika Kuoppala (2018-01-16 15:21:16)
There is a suspicion that with aggressive upclocking, power rail
voltage fluctuations can disrupt c state transition, leading
to system hang.
When upclocking with 4 cpu Baytrails, bring up cpus to c1 and then
go through bins gradually towards target frequency to give leeway
for hw.
We go towards requested frequency on 1 millisecond intervals. For
each 1 millisecond, we increase the frequency by half of bins
that are in between current frequency and target.
Either this is good for everyone or it is not. Doing more punit accesses
seems counter productive though, and adds 8ms to the initial request?
Wanted to see if it is not punit access in itself but voltage rampup. We
can forget this patch as atleast with these values as it didn't survive
night.
I noticed this patch was lacking the ping Chris' version has. Is that
in the intel_idle driver now ? And did your test kernel have the intel_idle
patch? If not the lack of the ping may be the reason why this patch did not
survive the night.
Regards,
Hans
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