Re: MULTIPROCESSOR enabled by default on all Alpha kernels

[Jason Thorpe <thorpej%me.com@localhost>]

> On Sep 19, 2020, at 9:39 AM, Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost> wrote:
> 
>> The system has been very stable for me, and is feeling much snappier.
> 
> I'm afraid if timecounter(9) using multiple PCC processor clocks
> works properly.

Yes, I think there are some known issues.  Taylor (CC'd) also had some thoughts on it?

> 
> I've committed it back in 2007 to switch alpha port to MI timecounter(9),
> https://mail-index.netbsd.org/source-changes/2007/07/21/0012.html
> https://mail-index.netbsd.org/source-changes/2007/07/21/0013.html
> but IIRC ad@ pointed out that x86 TSC implementation (that alpha's
> PCC implementation was based on) was problematic.
> 
> There was also a report that sleep(1) or TOD etc. didn't work
> as expected if timecounter(9) was pcc (and worked fine with
> clockinterrupt).
> 
> ---
> Izumi Tsutsui

-- thorpej