Comment 357 for bug 1690085

(In reply to Chris Hall from comment #267)
> (In reply to Chris Hall from comment #217)
> > (In reply to Klaus Mueller from comment #214)
> > > (In reply to Chris Hall from comment #212)
> > > > I admit that the PSU I was using was (a) old and (b) cheap. I have now
> > > > replaced that by a brand-new, more efficient PSU which supports 0A
> loads
> > > > across all voltages. I am running that with C6 enabled, and await
> > > > developments.
>
> > > Could you please tell which PSU you're now testing?
>
> > It's a "be quiet! Straight Power 11", Model E11-450W (BN280).
>
> I have been running with the new PSU with C6 enabled (package and core), and
> with CONFIG_RCU_NOCB_CPU=y and rcu_nocbs=0-15, for 10 days.
>
> This morning the machine was frozen. So, new PSU has not cured the problem.

Thanks for your reply!

> With the old PSU the machine was freezing every 2-3 days. So, things have
> improved... which could be the PSU, but the kernel (now 4.15.10) and other
> software has been updated and the idle load on the machine depends on how
> frequently somebody tries to ssh in :-(
>
> The BIOS for my ASUS Prime X370-PRO does not have the magic "Power Supply
> Idle Control". I will now try zenstates.py --c6-package-disable".

I've got the same board. My workaround is to overclock the CPU a bit: I'm using the PC scenario "Daily computing" (+200 MHz) - all other configurations are default and no RCU or C6 - workaround. Panagiotis Malakoudis had to use even higher overclocking (see comment 223) to work around the problem - but he has another CPU if I remember correctly - I have a AMD Ryzen 7 1700X and my clock for DRAM is 2400 MHz (default - it isn't changed). Overclocking doesn't affect power consumption here in idle mode (I tested it)!

Maybe you want to try it?