ChanServ changed the topic of #asahi-gpu to: Asahi Linux: porting Linux to Apple Silicon macs | GPU / 3D graphics stack black-box RE and development (NO binary reversing) | Keep things on topic | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-gpu
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<phire>
It almost looks big enough to contain a complete frame. Assuming the ram type is optimised for fast-fill and slow scanout, and frame compression is involved
<phire>
I wonder if there are preformance counters for the number of sdram wakeups
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<phire>
Playing around with /usr/bin/powermetrics on my 14" m1 pro max
<phire>
There is definitely not enough ram in DISP for the internal display, you can see the bandwidth changing on an idle screen when you change the refresh rate
<phire>
Though, weird things happen with "promotion"
<phire>
Um... Maybe it can store an entire frame, but only with promotion enabled. The bandwidth numbers are very different with promotion (and DRAM power consumption when nothing is changing on the screen is a lot lower)
<_jannau_>
I'm not yet sure how promotion works. How large is your promotion enabled window. They might use an overlay plane for that ad don't refresh the whole screen at 120 Hz
<phire>
well, its adaptive. goes as low as 24fps
<phire>
the weird thing is that I'm not even sure its sending unmodifed data to the screen. With promotion off, bandwidth metrics show ~9mb per frame of DISP RD and ~6mb per frame of DISP WR
<phire>
it's clearly compressed, the amount of data depends on whats on screen
<phire>
but they are roughly equal
<phire>
with promotion off, the per-frame DISP RD stays about the same, but the per frame DISP WR drops to just a few hundred KB (for a roughly idle screen)
<phire>
I'm not sure which direction these bandwidth counters are? is DISP reading the new frame into itself, and then deciding nothing is changed? Or is the RD the scanout going to the display?
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