Re: [Xen-devel] Radeon DRM dom0 issues

[Michael D Labriola <mlabriol@xxxxxxxx>]

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...

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



 




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