Am 13.05.2014 15:22, schrieb Alex Deucher:
On Mon, May 12, 2014 at 7:38 PM, Grigori Goronzy <greg@xxxxxxxxxxxx> wrote:
I can confirm this fixes it for me, too.
3.15 with these fixes and the large PTE patches actually ends up being
noticeably slower than earlier kernels with Xonotic, though. I wonder what's
going on.
Allocation overhead?
Unlikely, Xonotic just allocates a single page table at start, which
then gets extended to a certain rate until they no longer need more
address space and are done with it.
Grigori, can you bisect and/or try to figure out what's wrong here?
Christian.
Grigori
On 12.05.2014 14:50, Christian König wrote:
I could reproduce the problem with xonotic and I think I've found the
issue.
Please test the attached patch.
Thanks,
Christian.
Am 11.05.2014 11:06, schrieb Christian König:
I have tested it and it doesn't fix the hangs.
Yeah, thought so. Well it was just a guess.
(Also, I don't like the patch, because it reverts the behavior I added
for userspace buffers.)
Actually it shouldn't affect that. The alternative domain always
contains GART even when userspace only specified VRAM as placement (as
long as it is technical possible to do so).
So what should happen is that TTM sees the current placement, matches
that with the desired placement and should find that it doesn't need
to move the buffer (we should just test if this behavior really works
as expected).
Christian.
Am 10.05.2014 23:38, schrieb Marek Olšák:
Hi Christian,
I have tested it and it doesn't fix the hangs.
(Also, I don't like the patch, because it reverts the behavior I added
for userspace buffers.)
Marek
On Sat, May 10, 2014 at 6:34 PM, Christian König
<deathsimple@xxxxxxxxxxx> wrote:
Couldn't reproduce the issue so far. So the attached patch is just a
complete shoot into the dark found by rereading the code, but it might
actually be the problem.
Please give it a try.
Going to keep testing in the meantime,
Christian.
Am 10.05.2014 10:23, schrieb Christian König:
I see hangs with kernel 3.15 and SI under memory pressure, e.g. if
I boot
with radeon.vramlimit=256 and then run Xonotic timedemo with high
settings.
I haven't had a chance to bisect it yet, but it might be a similar
problem.
Sounds like the same issue to me. Thx for the good test case.
Any idea what is wrong with it?
Actually I already wondered that it went so smooth without any
regression
so far, didn't noticed the bug in bugzilla.kernel.org yet.
Some of the tests allocate a lot of MSAA textures and the tests also
run in parallel, which creates a lot of memory pressure and probably
causes buffer evictions.
Sounds like the underlying problem to me. We probably evict some
part of a
page table without updating the page directory. Going to dig into
it today,
it's probably just a one liner missing somewhere in the VM code.
Christian.
Am 09.05.2014 23:39, schrieb Grigori Goronzy:
On 09.05.2014 20:03, Marek Olšák wrote:
This commit which first appeared in 3.15-rc1 causes hangs on
Bonaire:
[...]
The simplest way to reproduce the hangs is to run piglit with these
parameters:
-t texelFetch.fs
Some of the tests allocate a lot of MSAA textures and the tests also
run in parallel, which creates a lot of memory pressure and probably
causes buffer evictions.
I see hangs with kernel 3.15 and SI under memory pressure, e.g. if
I boot
with radeon.vramlimit=256 and then run Xonotic timedemo with high
settings.
I haven't had a chance to bisect it yet, but it might be a similar
problem.
Grigori
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