Re: XEN MTRR

[geaaru <geaaru@gmail.com>]

Hi at all,

I confirm this issue on gentoo with kernel 3.4.0.

However, in my case i can't use nouveau because fan is always at 100% for a problem of the driver.

If I use nvidia driver in my case kernel doesn't oopps but I have always black screen. So if I can help you I can retrieve dmesg and kernel log through ssh.

My video card is gts 250.

Regards,

geaaru


On Thu Jun   7 2012 05:58:14 PM CEST, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> wrote:

> On Thu, Jun 07, 2012 at 08:49:37PM +1000, aorchis@gmail.com wrote:
> > On Wed, Jun 6, 2012 at 2:17 AM, Konrad Rzeszutek Wilk
> > <konrad.wilk@oracle.com> wrote:
> > > On Sun, Jun 03, 2012 at 05:31:32PM +1000, aorchis@gmail.com wrote:
> > > > Hi Jeremy and Konrad,
> > > 
> > > CC-ing xen-devel.
> > > 
> > > > 
> > > > Basically the driver NVIDIA provided is a binary blob and recent
> > > > versions does not work with the PAT layout of XEN so it falls back
> > > > to MTRR to provide write combining (please correct me if I'm
> > > > wrong).
> > > 
> > > OK? Which is still OK. Are you using a v3.4 kernel with an up-to-date
> > > NVidia driver? I've had reports that it works OK.
> > 
> > I briefly tried kernel 3.4 to see if the problem is fixed but it's not.
> > I used v3.4 kernel with NVIDIA driver v295.49 and a beta version
> > (v302) but both didn't work.
> > 
> > When the nvidia module is loaded, it prints out an error message:
> > "NVRM: PAT configuration unsupported, falling back to MTRRs."
> > 
> > When I launch Xorg, the screen turns blank then the monitors powered
> > down and my box hard crashed, I had to hold the power button to turn
> > it off.
> 
> Ok, lets CC Ben - he might have more up-to-date information. Also
> you might want to setup a serial console to capture the kernel to see
> where it crashes.
> 
> > 
> > This only happens in dom0 under XEN, if I run my dom0 by itself then
> > the nvidia module loads fine.
> > 
> > > > However there is no MTRR support on XEN so the driver hard crashed
> > > > my machine (I can't ssh into the box anymore).
> > > > 
> > > > Moreover, there is problem with the open source driver 'nouveau'
> > > > for NVIDIA card  (also has something to do with PAT layout of XEN)
> > > > which causes memory corruption.
> > > 
> > > Huh? Can you point me to a bugzilla please? There was a corruption
> > > issue where you can pass in 'nopat' on the command line.
> > 
> > Yes, that is the issue I was referring to, I had to pass "nopat" to
> > GRUB in order
> > to fix it.
> 
> Ok, so there is afall back for you.
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel


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