Re: ttm_bo_move_accel_cleanup unreserve bug ?

[Jerome G. <gl...@fr...>]

On Sat, 2009-04-18 at 21:06 +0200, Thomas Hellström wrote:
> Jerome Glisse wrote:
> > Hi Thomas
> >
> > I am getting massive error on x86_64, things like :
> > BUG: Bad page map in process gnome-session  pte:1f1d1d1d01000000
> > pmd:321a6067
> > keep filling the log until very bad things happen.
> > Do you have any idea what might cause that in ttm ?
> > My assumption is that ttm vm code is guilty their.
> > Note that on x86 exact same code seem to run fine.
> > All this with 2.6.29 final.
> >
> > Cheers,
> > Jerome Glisse
> >
> >   
> Hi, Jerome!
> 
> The TTM code may well be guilty here. I haven't tested x86-64 for a 
> while, but I can probably give it a try on openChrome next week.
> 
> /Thomas

Okay so i really narrowed it down to asking for WC memory, so my guess
is that either my CPU (AMD Athlon(tm) Dual Core Processor 4450e) have
PAT issue either TTM PAT/WC code is wrong somehow. I haven't time yet
to go deeper with this but i think it worked on an Intel Core2 CPU
with x86-64. Also it seems other people doesn't have the issue with
WC on x86-64.

PS: Sorry for all the noise, the bug didn't always showed up quickly so
i had false feeling. I am yet unsure it's fully fixed but so far all my
test case which triggered it seems to work fine.

Cheers,
Jerome