slow screen updates on laptop console (i386)

[Rick Macklem]

John Baldwin wrote:
> On Monday, December 07, 2015 06:01:08 PM Rick Macklem wrote:
> > Adrian Chadd wrote:
> > > Hi,
> > > 
> > > ok. please file a bug for that. It may be something to do with the
> > > hardware and sleep states and skipping wakeups/interrupts or
> > > something.
> > > 
> > > Please try using the default again (LAPIC?) and set
> > > kern.eventtimer.periodic=1. See if that fixes it.
> > > 
> > Actually made it worse. Instead of being intermittently slow, it was
> > almost constantly slow.
> 
> Try disabling C-states if they are enabled.  If you have a BIOS option
> for C1E you might need to disable that as well.  If this fixes it, then
> there isn't a really viable solution in software, and you might prefer
> to use the RTC to get the power savings from C-states.
> 
Oh, I do see stuff like:
hw.acpi.cpu.cx_lowest: C2
and
dev.cpu.0.cx_supported: C1/1/1 C2/2/1 C3/3/85

Is there a sysctl to disable "C states"?

Thanks, rick
ps: Like I said, I don't care, but maybe Adrian would like me to try settings?

> --
> John Baldwin
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