Strangely iotop is showing unity-system-compositor's "Mir/Comp" thread
is one of the top disk writers. If that's the problem then USC holding
on to bypass frames too long would explain it.
** Also affects: unity-system-compositor
Importance: Undecided
Status: New
** Changed in: unity-system-compositor
Importance: Undecided => High
** Changed in: unity-system-compositor
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1664150
Title:
[performance] Unity8 rendering hiccups/stutters exactly every 5
seconds in unison with disk activity
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