[Bug 44523] New: nexuiz perf regression since u_vbuf: implement another upload codepath which unrolls indices

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=44523

             Bug #: 44523
           Summary: nexuiz perf regression since u_vbuf: implement another
                    upload codepath which unrolls indices
    Classification: Unclassified
           Product: Mesa
           Version: git
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: lists@andyfurniss.entadsl.com


d-r-t kernel, HD4890.

Since -

commit ce44bae366ade59fb2dbdfbfe5a1ab8d24518a57
Author: Marek Olšák <maraeo@gmail.com>
Date:   Tue Jan 3 22:01:03 2012 +0100

    u_vbuf: implement another upload codepath which unrolls indices

    Improves performance from cca 1 fps to 23 fps in Cogs.
    This new codepath is not always used, instead, there is a heuristic which
    determines whether to use it. Using translate for uploads is generally
    slower than what we have had already, it's a win only in a few cases.

I get quite a noticeable perf regression running demo1 in nexuiz.

Other games (openarena,ut2004 demo, etqw) seem unaffected 


91.2740132 fps, one-second fps min/avg/max: 50 99 231 (90 seconds)

to

55.6802612 fps, one-second fps min/avg/max: 19 69 231 (90 seconds)

Sometimes I saw a couple of short (1/4 sec) stalls as well, which gave worse
results, above was without stalls.

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