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G76 perf drop after Android Q update (bandwidth problem?)

leogst over 6 years ago

Hello,

We are running into an issue where an existing GLES3 app rendering performance has dropped significantly after upgrading a couple of Galaxy devices S10 (SM-G975F, SM-G970F) from Android Q from P.

Unfortunately I can't provide an actual apk nor a minimal example reproducing the issue right now but I've managed to narrow the issue down to a two-pass separable blur with a rather large kernel size (size 41). The blur is performed on a region of a 720x1280 RGBA texture with scissors covering about 40% to 60%. Both horizontal and vertical blurs are manually unrolled in the FS.

I ran a couple of Streamline captures (see attached files) for the exact same app running on two different devices:

(A) SM-G975F (G76) with Android 10
(B) an older SM-G950F (G71) with Android 9

I know comparing different GPUs is far from ideal but it's the best I can do given that I don't have any G76 devices running Android 9 available right now.

Comparing A to B seems to show there is now a huge difference in bandwidth use (4.83/5.40 GiB vs 288/300 MiB) for the selected timespan. I am new to Streamline so I might be misinterpreting its output, please correct me if that's the case.

Any ideas on what may trigger this behavior? I guess I'm doing something the newer driver doesn't like but I have no idea what.

Thank you.

Leo.

Streamline captures (screenshots)

Android9 - G71