#dri-devel on 2024-01-20 — irc logs at oftc.irclog.whitequark.org

2022-12-21 00:45 ChanServ changed the topic of #dri-devel to: <ajax> nothing involved with X should ever be unable to find a bar

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01:30 <jenatali> gfxstrand: Congrats, your wish was granted: https://www.phoronix.com/news/Mesa-Vulkan-Driver-Runtime

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02:21 <Company> reading that post makes me think that it's inevitable that you end up with such a layer

02:22 <Company> because you want backwards compatibility and at some point that means an implementation of the old stuff using the new stuff

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14:25 <glehmann> > Improves CTS runtime by a lot.

14:25 <glehmann> konstantin: how much is a lot?

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15:10 <konstantin> glehmann: I was too lazy to check against main (it takes 3-4 hours to run) but I think it's >20%

15:10 <glehmann> nice

15:12 <konstantin> I remember running a caselist (size 500, piglit+zink) which compiled 50k sample functions so it's not a surprise to me

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16:38 <alyssa> konstantin: and i thought vk cts runtime was bad!

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17:50 <JoshuaAshton> sima: Has the concept of surfacing fence errors up through to userspace ever come up? It'd be nice if from a compositor side that we knew if the syncobj was signalled due to a hang,etc so we don't display garbage and can ignore the commit.

17:50 <JoshuaAshton> cc: daniels emersion also, you might be interested in this.

17:51 <JoshuaAshton> That would also allow drivers to reliable return VK_ERROR_DEVICE_LOST in vkWaitSemaphores etc

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18:03 <daniels> yeah that’s an idea - I was going to say that you should be getting DEVICE_LOST but yeah you wouldn’t notice it on external imports

18:05 <JoshuaAshton> We'd also have to consider semantics for how that would interact with event fd

18:05 <JoshuaAshton> Gamescope does all of it's dmabuf latch waits with epoll, so we could either POLLHUP or regular POLLIN and have a query for the error

18:05 <JoshuaAshton> Not sure which would be most ideal there

18:06 <JoshuaAshton> (speaking about when we do explicit sync with external syncobj + eventfd in the future fwiw, *right now* we just wait on the dmabuf fd)

18:09 <JoshuaAshton> This is also a problem for SteamVR (and probably monado?) which has always been external sync with semaphores

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18:39 <daniels> I think you’d still have to do POLLIN in order to not break existing users

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19:34 <JoshuaAshton> Makes sense

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23:18 <sima> JoshuaAshton, uh ... very tricky topic

23:18 <sima> and also a bit very late now, can you ping me again on monday or so?

23:19 <sima> because my brain isn't in a state where remembering todo stuff works :-P

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23:28 <airlied> JoshuaAshton: I'm sure sima can fill in more detail, but yes it has come up, I think i915 even did it for a bit, but it got really messy when fences start getting passed around through processes and across security boundaries, like X.org dying because of misc error on a client fence etc

23:54 <JoshuaAshton> Ah yes, I forgot it's Caturday! ^_^

23:55 <JoshuaAshton> airlied: Hmm, I guess what I want is a way to just know if the syncobj was signalled due to an error or if it was signalled because the work was actually complete

23:55 <JoshuaAshton> Not for it to kill/error a process