[Wayland-bugs] [Bug 81323] New: weston, when under x11, in sw-render mode, uses lots of processing power

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81323

          Priority: medium
            Bug ID: 81323
          Assignee: wayland-bugs at lists.freedesktop.org
           Summary: weston, when under x11, in sw-render mode, uses lots
                    of processing power
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: sudoman at ninthfloor.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 1.5.0
         Component: weston
           Product: Wayland

there is (briefly) high cpu usage when launching 'weston' (under x11 with
forced software rendering), and continuously as one moves the cursor around in
that session. cpu usage is consistently around 30-40% on all cores as the
cursor moves. otherwise, there is not much computation happening.

without sw-rendering, this is not an issue under x11.

when using weston-launch under a tty, in sw-rendering mode, there is no
apparent performance hit, and htop shows no significant cpu usage.


to force software rendering before launching weston:

$ export LIBGL_ALWAYS_SOFTWARE=1


i'm using weston master.

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