ChanServ changed the topic of #panfrost to: Panfrost - FLOSS Mali Midgard & Bifrost - Logs https://oftc.irclog.whitequark.org/panfrost - <macc24> i have been here before it was popular
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<alyssa>
Panfrost mode activate =)
<macc24>
bifrost_performane -= 10
<alyssa>
bbrezillon: pointed out a piglit fail with the AFBC branch. was going to check that out
<alyssa>
oh and this is a legitimate regression from AFBC
<alyssa>
__builtin_ffs()
<alyssa>
DATA_INVALID_FAULT from this particular AFBC thing
<alyssa>
note: blit shaders are not setting the shader reg alloc bit correctly, this hurts perf
<alyssa>
also can probably set some overdraw flags..
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<alyssa>
the broken case is INTERSECT with AFBC... but effective tile size is 16x16 and it's 16x16 AFBC and that shouldn't cause faults anyway
<alyssa>
apparently have a R32F AFBC texture. that seems.. wrong
<alyssa>
allegedly it's a thing.
<alyssa>
....but not on v7
<alyssa>
is it on v6? dunno
<alyssa>
More to the point, it's not allowlisted in Panfrost.
<alyssa>
so we're missing a decompression for copyimage nonsense
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<alyssa>
macc24: MESA: warning: Disabling AFBC with a blit. Reason: Incompatible AFBC formats when rendering
<alyssa>
I'm glad you made me add those warnings with PAN_MESA_DEBUG=perf ;-P
<alyssa>
cphealy: AFBC MR will make you happy :)
<alyssa>
glmark2 -brefract from 44fps to 59fps on g52
<cphealy>
Wohoo!
<alyssa>
glmark2 -bdesktop from 205fps to 238fps on g52
<cphealy>
alyssa: very nice!
<alyssa>
cphealy: TBF this worked in the past but had to be disabled due to bugginess
<alyssa>
I'm now at 4 distinct AFBC bugs fixed in my "reenable" MR
<alyssa>
Incidentally, 3/4 of those affect older Malis too
<alyssa>
so they're just straight up bug fixes... that AFBC is advertised on older Mali but not v7 is less "v7 AFBC is especially buggy" and more "our test infra is biased towards v7"..
<cphealy>
Now we just need that buffer regression with glmark2 worked out and we may actually be faster than...
<cphealy>
;-)
<alyssa>
glmark2 -bbuffer is totally CPU bound for me
<alyssa>
I am curious if it's also CPU bound with the DDK
<cphealy>
No, DDK is not CPU bound.
<alyssa>
Interesting.
<cphealy>
DDK was hitting 58fps for me while Mesa 21.1 was 51fps. With Mesa 21.2, fps dropped to 3fps.
<alyssa>
would love the bisect
<cphealy>
The DDK vs Mesa 21.1 comparison was not completely apples-to-apples though as DDK had AFBC enabled while Mesa 21.1 did not have AFBC in my case.
<cphealy>
Yea, I need to do that.
<alyssa>
except for maybe the winsys*, -bbuffer doesn't use AFBC regardless
<cphealy>
Even for the render buffer for display scanout?
<alyssa>
that's winsys
<alyssa>
I don't think the Linux DDK builds do AFBC for the winsys
<alyssa>
The Android DDK does, I believe.
<alyssa>
and the fbo-drawbuffers-none fail is a real regression since AFBC as well. Groan
<alyssa>
AFBC with MRT. Mm...
<alyssa>
....overlapping internal buffer offsets?
<alyssa>
no, this is wrong, missing views still take up space in the tilebuffer
<alyssa>
but why would that only be a problem with afbc..
<alyssa>
Too much changes when enabling afbc for the cmdstream to make much sense here.
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<alyssa>
gl_FragColor with MRT... mmhmm...
<alyssa>
still not clear how AFBC would affect anything
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<alyssa>
Uhhhhhhhhhhhhh
<alyssa>
This is taking a turn for the weird.
<alyssa>
Uhm.
<alyssa>
...It's a bug in the variants cache. Awful.
<cphealy>
Sounds like your finding all kinds of "opportunity" ;-)
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<alyssa>
cphealy: Hm?
<alyssa>
I fixed it.
<alyssa>
And it turns out the bug wasn't even AFBC related, just a random* fail triggered by the AFBC change
<alyssa>
* Deterministic but dependent on call order and other stuff Gallium that doesn't make any guarantees about so liable to break at any moment
<alyssa>
dEQP error: u_blitter:600: Caught recursion. This is a driver bug
<alyssa>
that.. cannot be good
<alyssa>
Someone doesn't look my decompression
<alyssa>
*like
<alyssa>
sampling issue. Hm
<alyssa>
tex PIPE_FORMAT_Z24_UNORM_S8_UINT
<alyssa>
sampler PIPE_FORMAT_X24S8_UINT
<alyssa>
What a joy.
<alyssa>
Those are compatible for AFBC, right?
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<alyssa>
yes, they are. so just need to write moar code to handle AFBC compatibility the Right way
<alyssa>
right.. okay.
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