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

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Jun 11 15:58:57 PDT 2010


           Summary: Bitmap font embedded in TTF causes massive X server
                    CPU usage
           Product: xorg
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: clee at freedesktop.org
         QAContact: xorg-team at lists.x.org

Steps to reproduce:
1. Install the Anonymous Pro font (yum install msimonson-anonymouspro-fonts on
F13, or download+install manually from
http://www.ms-studio.com/FontSales/anonymouspro.html )
2. Set GNOME terminal font to Anonymous Pro, size 8pt (assuming X server DPI is
set to 96)
3. In a GNOME-terminal window, run a program that spews a lot of text; an
example Python script which will do the job is available at

Expected result:
Spewing dozens of lines of text per second should causes barely any noticeable
extra CPU overhead.

Actual result:
My X server's CPU usage jumps to well over 70% and according to sysprof most of
my CPU time is being spent inside drm_gem_object_alloc, which is being called
by radeon_gem_object_create.

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