[Bug 93797] [BXT-P/APL] Low performance on UI, even without graphic interface

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93797

--- Comment #16 from Imre Deak <imre.deak at intel.com> ---
(In reply to Humberto Israel Perez Rodriguez from comment #15)
> (In reply to Imre Deak from comment #14)
> > (In reply to Imre Deak from comment #13)
> > > Two other BIOS setup options under 'CPU Configuration'/'CPU Power
> > > Management' to get rid of the lag (either one alone gets rid of the lag
> > > while having the above RC6 and GT PM options enabled):
> > > 1. Max Core C State: 'Fused value'->'Core C6'
> > > 2. Max Package C State: 'S0ix default' -> 'C0'/'PC2'
> > 
> > Err, the above correctly is 'S0ix default' -> 'C0'. Setting it to PC2 is not
> > enough.
> 
> Hi Imre Deak :
> 
> Can you teach me how to set up this two BIOS features in the grub 
> 
> 1. Max Core C State: 'Fused value'->'Core C6'
> 2. Max Package C State: 'S0ix default' -> 'C0'
> 
> like in your previous comment , i mean something like this :
> i915.enable_rc6=0
> 
> i would appreciate your help in this, because i can set up in the BIOS, but
> is most comfortable set it in grub menu, thanks in advanced

I don't know of any option to limit the package C state. There seems to be
processor.max_cstate to limit the core C state, but for some reason I had to
limit it to C2 as opposed to the C6 limit I set in BIOS. So removing the
i915.enable_rc6=0 option and booting with processor.max_cstate=2 also gets rid
of the problem.

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