big.LITTLE status for rk3399/rockpro64?

[Emmanuel Vadot]

On Mon, 13 Jul 2020 19:06:22 +0100
Danilo Egêa Gondolfo <danilo at freebsd.org> wrote:

> On Mon, Jul 13, 2020 at 6:27 PM Vincent Milum Jr <freebsd-arm at darkain.com>
> wrote:
> 
> > I'm curious about this, too. I recently got the Pinebook Pro up and
> > running, and would like to start testing all 6 CPU cores for doing
> > compilation tasks.
> >
> > On Mon, Jul 13, 2020 at 10:19 AM Josh Howard <bsd at zeppelin.net> wrote:
> >
> > > It looks like it's been a couple of months since there's been any news
> > > around it. Anything in particular still needed as far as testing or
> > > debugging that goes? I have a Rockpro64 and a RockPi4e (though I don't
> > have
> > > that booting yet.) that I could potentially test on.
> > >
> > > Thanks
> > >
> > >
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> 
> The number of CPUs was limited here
> https://svnweb.freebsd.org/base?view=revision&revision=360321
> 
> If you remove the hw.ncpu from your loader.conf you'll be able to use all
> the 6 cores.
> 
> Although the commit message mentions a "known issue" with the big.LITTLE
> architecture, I was able to use all the 6 cores to rebuild the entire
> system and I didn't face any issue.
> 
> Maybe manu@ could give us some context about that.

 On rockpro64 it was (it's been a while since I've tested) very easy to
trigger a panic doing anything usb related (sometimes just inserting a
usb thumb drive would triggers it). This is why I've disabled the big
cores on the rockpro64 image.

-- 
Emmanuel Vadot <manu at bidouilliste.com>