[Bug 23143] New: bad performance regression in doom3

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=23143

           Summary: bad performance regression in doom3
           Product: Mesa
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/r200
        AssignedTo: dri...@li...
        ReportedBy: sr...@tu...


doom3 only runs at about one third to about half the performance it used to
(due to #22372 I can't get a full benchmark run, and due to #23142 the numbers
in r200 mode are questionable but this happens in arb mode, which looks ok,
too). Quick profiling didn't show much user cpu consumption, though the top
consumer was legacy_is_pending, with lots of time spent in the kernel. So not
sure what makes it wait for the gpu that much more than it used to. (Tested
without kms and with dri1 so kms can't be blamed, and this is mostly compressed
textures so texture tiling shouldn't really influence this neither.)


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