BrowserNotifiedToBeforeGpuSwap2 regressed between 2x and 3x on 50th percentile on Canary across all platforms. |
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Issue descriptionEvent.Latency.Scroll[Begin|Update].Touch.BrowserNotifiedToBeforeGpuSwap2: https://uma.googleplex.com/timeline_v2?sid=0ec5fa79600d85123056dcf3b2d3fe0f Event.Latency.Scroll[Begin|Update].Wheel.BrowserNotifiedToBeforeGpuSwap2: https://uma.googleplex.com/timeline_v2?sid=abad462a4f81cfef02ade6cd802f2916 Regression range (73.0.3641.0 - 73.0.3642.0): https://chromium.googlesource.com/chromium/src/+log/73.0.3641.0..73.0.3642.0?pretty=fuller&n=10000 Please note that the regression is both for wheel and touch scrolling, both begin and update metrics. It happened on Android, Windows, Mac, and ChromeOS. The regression is for low percentiles only (The 99th percentiles have not regressed).
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Dec 19
UKM shows the regressions for youtube and facebook.
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Dec 19
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Dec 20
Had a chat with nzolghadr@ who is gonna work on the repo. For repo information: UMA shows the regression on Pixel 2
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Jan 16
(6 days ago)
from the regression range the following two commits looks related: https://chromium-review.googlesource.com/c/chromium/src/+/1375641 https://chromium-review.googlesource.com/c/chromium/src/+/1372894 tdresser@ suggested to check telemetry regressions since this regression has happened on 50th percentile our telemetry tests might catch this.
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Jan 18
(4 days ago)
telemetry doesn't show anything. All the telemetry tests are running on Nexus 5 and it doesn't show any regression on that device. Looking at UKM it is clearly visible on the facebook mobile website though.
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Yesterday
(39 hours ago)
We have FYI bots showing pixel 2 data here: https://chromeperf.appspot.com/report?sid=0478f6bd77326e0b4fe9c5f7c44e007dd3fb2189ca4fb5b305343bd4a2f97f4f&start_rev=575988&end_rev=624034 (probably internal only).
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Yesterday
(38 hours ago)
Oh. Great. I didn't know that. Sadrul, this FYI bot does show the regression on the date that it happened. Could you take a look at it now. Although the bisect functionality is not yet available on that bot.
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Today
(12 hours ago)
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Comment 1 by sadrul@chromium.org
, Dec 19Owner: sahel@chromium.org