** Branch linked: lp:~ci-train-bot/mir/mir-ubuntu-zesty-2369
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https://bugs.launchpad.net/bugs/1651638
Title:
[regression] Latency for fullscreen interval 0 clients (e.g. games and
benchmarks) increased with the introduction of nested passthrough
Status in Mir:
Fix Committed
Status in Mir 0.25 series:
Triaged
Status in mir package in Ubuntu:
New
Bug description:
Nested fullscreen interval 0 clients in Mir 0.25.0 had higher latency
than interval 1 nested fullscreen clients.
I've reproduced this a couple of times and it is concerning:
Mir 0.25:
Interval 0: 81ms <-- regression
Interval 1: 64ms <-- improvement
Mir 0.24:
Interval 0: 70ms
Interval 1: 96ms
It's the obvious green spike in this chart:
https://docs.google.com/spreadsheets/d/1RbTVDbx04ohkF4-md3wAlgmxbSI1DttstnT6xdcXhZQ/pubchart?oid=1566479835&format=interactive
Although this regression appears to be resolved in the 0.26 series
(lp:mir) it's serious enough that we should look into finding what the
cause was so that Mir 0.25.1 can get the same fix.
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