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Servo uses a lot of CPU when moving the mouse #18771

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mateon1 opened this issue Oct 6, 2017 · 3 comments
Open

Servo uses a lot of CPU when moving the mouse #18771

mateon1 opened this issue Oct 6, 2017 · 3 comments
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I-perf-slow

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@mateon1
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@mateon1 mateon1 commented Oct 6, 2017 •
edited

Even on about:blank, Servo can use 70% CPU (100% = 1 core) while moving the mouse. The cause of slowness seems to be swrast_dri.so, not Servo itself, but it won't hurt to report this here.

Release mode flamegraph
Debug mode flamegraph
@paulrouget
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@paulrouget paulrouget commented Oct 6, 2017

Happened before: #9999
@KiChjang
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@KiChjang KiChjang commented Oct 6, 2017

Is this on debug or release mode?
@jdm jdm added the I-perf-slow label Oct 6, 2017
@mateon1
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@mateon1 mateon1 commented Oct 6, 2017 •
edited

@KiChjang Sorry for the late reply, this happens in release mode as well as debug mode (both flamegraphs are linked in the original comment).
It seems that most (~40% on release mode) CPU time is spent in "swrast_dri.so", which seems to be a mesa OpenGL driver.
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@jdm @paulrouget @mateon1 @KiChjang
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