Re: [Xen-devel] Radeon DRM dom0 issues

[Michael D Labriola <mlabriol@xxxxxxxx>]

xen-devel-bounces@xxxxxxxxxxxxx wrote on 01/21/2014 04:59:05 PM:

> From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> To: Michael D Labriola <mlabriol@xxxxxxxx>, 
> Cc: Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>, 
> michael.d.labriola@xxxxxxxxx, xen-devel@xxxxxxxxxxxxx
> Date: 01/21/2014 04:59 PM
> Subject: Re: [Xen-devel] Radeon DRM dom0 issues
> Sent by: xen-devel-bounces@xxxxxxxxxxxxx
> 
> On Mon, Jan 20, 2014 at 03:15:24PM -0500, Michael D Labriola wrote:
> > Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote on 01/20/2014 
> > 10:38:27 AM:
> > 
> > > From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> > > To: Michael D Labriola <mlabriol@xxxxxxxx>, 
> > > Cc: Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>, 
> > > michael.d.labriola@xxxxxxxxx, xen-devel@xxxxxxxxxxxxx
> > > Date: 01/20/2014 10:38 AM
> > > Subject: Re: [Xen-devel] Radeon DRM dom0 issues
> > > 
> > > On Mon, Jan 20, 2014 at 10:26:22AM -0500, Michael D Labriola wrote:
> > > > Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx> wrote on 01/20/2014 
10:14:36 
> > AM:
> > > > 
> > > > > From: Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>
> > > > > To: Michael D Labriola <mlabriol@xxxxxxxx>, 
> > > > > Cc: xen-devel@xxxxxxxxxxxxx, michael.d.labriola@xxxxxxxxx
> > > > > Date: 01/20/2014 10:14 AM
> > > > > Subject: Re: [Xen-devel] Radeon DRM dom0 issues
> > > > > 
> > > > > On Mon, Jan 20, 2014 at 09:58:32AM -0500, Michael D Labriola 
wrote:
> > > > > > Anyone here running a dom0 w/ Radeon DRM?  I'm having 
consistent 
> > > > crashes 
> > > > > > with multiple older R600 series (HD 6470 and HD 6570) and 
unusably 
> > 
> > > > slow 
> > > > > > graphics with a newer HD7000 (can see each line refresh 
> > indiviually on 
> > > > 
> > > > > > radeonfb tty).  All 3 systems seem to work fine bare metal.
> > > > > 
> > > > > I hadn't been using DRM, just Xserver. Is that what you mean?
> > > > 
> > > > The R600 problems happen when in X, using OpenGL, on my dom0.  The 

> > > > RadeonSI sluggishness is when using the KMS framebuffer device for 
a 
> > plain 
> > > > text console login.
> > > 
> > > So sluggish is probably due to the PAT not being enabled. This patch
> > > should be applied:
> > > 
> > > lkml.org/lkml/2011/11/8/406
> > > 
> > > (or http://marc.info/?l=linux-kernel&m=132888833209874&w=2)
> > > 
> > > and these two reverted:
> > > 
> > >  "xen/pat: Disable PAT support for now."
> > >  "xen/pat: Disable PAT using pat_enabled value."
> > > 
> > > Which is to say do:
> > > 
> > > git revert c79c49826270b8b0061b2fca840fc3f013c8a78a
> > > git revert 8eaffa67b43e99ae581622c5133e20b0f48bcef1
> > 
> > Thanks!  I cherry-picked that patch out of your testing tree, reverted 

> > those 2 commits, recompiled and installed.  Definitely fixed the HD 
7000 
> > sluggishness and appears to have fixed the R600 crashes (although it's 

> > only been running a few hours).
> > 
> > How come that patch didn't get into mainline?  It looks pretty 
innocuous 
> > to me...
> 
> <Sigh> the x86 maintainers wanted a different route. And I hadn't had
> the chance nor time to implement it.

I see.  Well, I've got a handful of boxes in my lab that need that patch 
to be usable.  If you do come up with a more mainline-able solution, I'd 
gladly test it for you.  ;-)

Thanks again, by the way.

---
Michael D Labriola
Electric Boat
mlabriol@xxxxxxxx
401-848-8871 (desk)
401-848-8513 (lab)
401-316-9844 (cell)



 



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