[PATCH 1/2] UBUNTU: [Config] enable MMIOTRACE for graphics debugging

Christopher James Halse Rogers raof at ubuntu.com
Thu Mar 18 05:43:52 UTC 2010


On Wed, 2010-03-17 at 03:03 -0700, Bryce Harrington wrote:
> On Wed, Mar 17, 2010 at 09:26:24AM +0000, Andy Whitcroft wrote:
> > Enable MMIOTRACE to allow us to trace low level card operations.  This is
> > commonly used to debug graphics issues particularly under Nouveau.
> > According to the documentation it is a near zero impact when disabled.
> 
> "when enabled" I hope?
> 
No; when it's enabled it's a huge performance hit.  It's not uncommon
for a mmio-traced nvidia blob to take multiple minutes to bring up X.
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