[Bug 28511] Bitmap font embedded in TTF causes massive X server CPU usage

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Feb 9 02:19:06 PST 2012


Michel Dänzer <michel at daenzer.net> changed:

           What    |Removed                     |Added
         AssignedTo|xorg-driver-ati at lists.x.org |xorg-team at lists.x.org
          Component|Driver/Radeon               |Server/General

--- Comment #6 from Michel Dänzer <michel at daenzer.net> 2012-02-09 02:19:06 PST ---
According to Chris on IRC, this also happens with a recent intel driver, so
it's probably an issue in code used with both drivers.

Running the referenced python script, the main difference I notice between the
Anonymous Pro and DejaVu Sans Mono fonts is that with the former, the X server
uses more CPU than gnome-terminal (similar to the referenced profiles), while
with the latter it's the other way around.

However, I'm not sure how the font could make any direct difference on the
server side; it's just glyphs there? So, maybe the Anonymous Pro font causes
gnome-terminal / VTE / Cairo / Xft / ... to use a different, less efficient
method for drawing the text? E.g. drawing fewer characters per call.

BTW, the latest profile is still mostly unusable, possibly due to known issues
with sysprof on 64 bit.

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