Re: Debian on qemu-system-sparc64

[Adrian Davey <adrian@beth2.org>]

Hi Artyom,

On 2016-01-25 21:39, Adrian Davey wrote:
> Hi Artyom,
>
> On 2016-01-25 17:42, Artyom Tarasenko wrote:
> > On Mon, Jan 25, 2016 at 12:05 PM, Adrian Davey <adrian@beth2.org> 
> > wrote:
> > > Hi all,
> > >
> > > Just thought I'd share a couple of things to help people use debian 
> > > on
> > > emulated sparc64 (sun4u).
> > >
> > > Currently, graphics is not functioning
> >
> > Interesting. This used to work with Debian 7 and older QEMU versions.
> > Is it regression in Debian or qemu-system-sparc64/OpenBIOS ?
> >
> > Could you please check if Debian 7 also hangs in your setup?
> >
> > Regards,
> > Artyom
>
> Ok I have finally installed debian 7 sparc (64 bit kernel, 32bit
> userland) on current (debian/unstable amd64) qemu-system-sparc64
> (sun4u) and indeed I can manually modprobe both drm and ttm that I
> thought I needed to blacklist on current sparc64 unstable.  So I tried
> again on current unstable sparc64, at least I get more than a hung
> system now...
snip
> Another item to note is that running
> `top` in debian/unstable sparc64 has a load of ~1.09 of an idle system
> (1.6 us, 2.9 sy, 0.0 ni, 95.5 id)
> while
> `top` in debian/7.9 sparc has a load of ~0.00 of an idle system (0.3
> us, 1.6 sy, 0.0 ni, 98.7 id)
>
> I am tempted to try the 4.3 kernel on the debian 7.9 VM to see what 
> happens...

Ok after a little fun with forcing dpkg architectures and depends in 
addition to a little bit of debian backports for initramfs-tools and 
udev + some guidance from 
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=+752742, I have the 
4.3 kernel running on debian/7.9~ sparc.

Same problem with bochs-drm as expected, but `top` remains the same for 
load stats as the previous kernel.

I wonder what is causing 64bit userland to spin so much on noops, or 
whatever it is doing.

> Regards,
>
> Adrian

Regards,

Adrian