Windows regressed the most, but macOS and Linux also regressed some. Windows also regressed on 2021-01-24 (86 Nightly), but neither macOS nor Linux regressed then. * [STMO graph for Windows](https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=Median&cumulative=0&end_date=2021-02-17&include_spill=0&keys=!__none__!__none__&max_channel_version=nightly%252F87&measure=CHECKERBOARD_SEVERITY&min_channel_version=nightly%252F86&os=Windows_NT&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=2021-01-26&trim=1&use_submission_date=0) * [STMO graph for macOS](https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=Median&cumulative=0&end_date=2021-02-17&include_spill=0&keys=!__none__!__none__&max_channel_version=nightly%252F87&measure=CHECKERBOARD_SEVERITY&min_channel_version=nightly%252F86&os=Darwin&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=2021-01-26&trim=1&use_submission_date=0) * [STMO graph for Linux](https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=Median&cumulative=0&end_date=2021-02-17&include_spill=0&keys=!__none__!__none__&max_channel_version=nightly%252F87&measure=CHECKERBOARD_SEVERITY&min_channel_version=nightly%252F86&os=Linux&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=2021-01-26&trim=1&use_submission_date=0) Looking at older telemetry, this recent Windows regression might be a reversal of an earlier, discontinuous improvements in CHECKERBOARDING_SEVERITY in 2020: * [STMO graph of Windows improvement on 2020-10-19](https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=Median&cumulative=0&end_date=2021-02-17&include_spill=0&keys=!__none__!__none__&max_channel_version=nightly%252F87&measure=CHECKERBOARD_SEVERITY&min_channel_version=nightly%252F80&os=Windows_NT&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=2021-01-26&trim=1&use_submission_date=0) * [STMO graph of macOS improvement on 2021-09-19](https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=Median&cumulative=0&end_date=2021-02-17&include_spill=0&keys=!__none__!__none__&max_channel_version=nightly%252F87&measure=CHECKERBOARD_SEVERITY&min_channel_version=nightly%252F80&os=Darwin&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=2021-01-26&trim=1&use_submission_date=0) * [STMO graph of Linux](https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=Median&cumulative=0&end_date=2021-02-17&include_spill=0&keys=!__none__!__none__&max_channel_version=nightly%252F87&measure=CHECKERBOARD_SEVERITY&min_channel_version=nightly%252F80&os=Linux&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=2021-01-26&trim=1&use_submission_date=0) shows a slow improvement over October and November, no discontinuous improvement like Windows and macOS. Is this a regression from enabling the SW-WR fallback in bug 1689203?
Bug 1693636 Comment 0 Edit History
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CHECKERBOARDING_SEVERITY regressed on 2021-02-02. Windows regressed the most, but macOS and Linux also regressed some. Windows also regressed on 2021-01-24 (86 Nightly), but neither macOS nor Linux regressed then. * [STMO graph for Windows](https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=Median&cumulative=0&end_date=2021-02-17&include_spill=0&keys=!__none__!__none__&max_channel_version=nightly%252F87&measure=CHECKERBOARD_SEVERITY&min_channel_version=nightly%252F86&os=Windows_NT&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=2021-01-26&trim=1&use_submission_date=0) * [STMO graph for macOS](https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=Median&cumulative=0&end_date=2021-02-17&include_spill=0&keys=!__none__!__none__&max_channel_version=nightly%252F87&measure=CHECKERBOARD_SEVERITY&min_channel_version=nightly%252F86&os=Darwin&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=2021-01-26&trim=1&use_submission_date=0) * [STMO graph for Linux](https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=Median&cumulative=0&end_date=2021-02-17&include_spill=0&keys=!__none__!__none__&max_channel_version=nightly%252F87&measure=CHECKERBOARD_SEVERITY&min_channel_version=nightly%252F86&os=Linux&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=2021-01-26&trim=1&use_submission_date=0) Looking at older telemetry, this recent Windows regression might be a reversal of an earlier, discontinuous improvements in CHECKERBOARDING_SEVERITY in 2020: * [STMO graph of Windows improvement on 2020-10-19](https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=Median&cumulative=0&end_date=2021-02-17&include_spill=0&keys=!__none__!__none__&max_channel_version=nightly%252F87&measure=CHECKERBOARD_SEVERITY&min_channel_version=nightly%252F80&os=Windows_NT&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=2021-01-26&trim=1&use_submission_date=0) * [STMO graph of macOS improvement on 2021-09-19](https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=Median&cumulative=0&end_date=2021-02-17&include_spill=0&keys=!__none__!__none__&max_channel_version=nightly%252F87&measure=CHECKERBOARD_SEVERITY&min_channel_version=nightly%252F80&os=Darwin&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=2021-01-26&trim=1&use_submission_date=0) * [STMO graph of Linux](https://telemetry.mozilla.org/new-pipeline/evo.html#!aggregates=Median&cumulative=0&end_date=2021-02-17&include_spill=0&keys=!__none__!__none__&max_channel_version=nightly%252F87&measure=CHECKERBOARD_SEVERITY&min_channel_version=nightly%252F80&os=Linux&processType=*&product=Firefox&sanitize=1&sort_keys=submissions&start_date=2021-01-26&trim=1&use_submission_date=0) shows a slow improvement over October and November, no discontinuous improvement like Windows and macOS. Is this a regression from enabling the SW-WR fallback in bug 1689203?