Re: [RFC PATCH 06/13] m68k: Drop ARCH_USES_GETTIMEOFFSET

[Michael Schmitz]

Hi Finn,

On 14/11/18 11:11 AM, Finn Thain wrote:
> On Tue, 13 Nov 2018, Michael Schmitz wrote:
>
> > Running a recent kernel under ARAnyM shows 40 ns resolution so the Atari
> > hardware emulation is a little more complete.
> You mean, 40 us resolution, right?

Sorry, typo. Should have been us of course.

> > Using that for initial tests, I can confirm that timer resolution is
> > reduced to 10ms after patch 6, and gets restored to 40ns after applying
> > the full series
> Thanks for testing!
>
> > (once clocksource_init runs, that is - the first part of the boot is at
> > 10ms resolution only, a regression compared to with use of
> > arch_gettimeoffset).
> Sounds like a theoretical regression (?)
>
> Is there any need for more precise timers (I mean, better than 40 us)
> before clocksource_init runs?

I don't think so, given that we can run just fine with 10 ms resolution.

> > Unfortunately, I can't log in at the console with all patches applied. I
> > immediately get the 'login timeout exceeded' message. Weird...
> I didn't see that in my tests... Was this aranym or real hardware or both?

ARAnyM only so far.

> Can you also test tree fbf8405cd982 please?
My tests were on c606b5cf902 in case it wasn't clear. I've now seen 
fbf8405cd982, one moment please ...

That one does appear to work - different versions of ARAnyM, and 
different userland versions though. I'll test that again with the setup 
that saw c606b5cf902 fail.

Cheers,

ÂÂÂ Michael