[Bug 28068] New: RV100 performance regressions (since 6.8.3 from 2005) and 1.7.6/6.13 from 2010

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28068

           Summary: RV100 performance regressions (since 6.8.3 from 2005)
                    and 1.7.6/6.13 from 2010
           Product: xorg
           Version: 7.5
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: darryl at darrylmiles.org
         QAContact: xorg-team at lists.x.org


I upgraded from FedoraCore4 (which has provided me good service for many years)
to Fedora12.  In doing so there were some obvious performance and rendering
differences that I could consider to be regressions.

In this bug report is to concentrate on describing the performance differences,
after consultation with the good folk on irc:freenode/#radeon I ran some
x11perf tests to highlight the issues and provide real numbers of my
experience.

Overall many tests have gotten a few %  (between 5 and 15%) over the past 5
years, however some of the worst regressions have gotten 20 times slower. 
Particulating relating to.


To explain the testing setup, it was exactly the same hardware, the X11 server
was started manually and free standing while the system was in a low runlevel
(in some cases 1/single-user).  Same LCD monitor, same resolution, same 64bit
variety of OS/Xorg/drivers.  The tests were then run and the output logged.

The 2005 versions are Xorg 6.8.3, Kernel 2.6.9-22.ELsmp x86_64, using UMS.

The 2010 version is Xorg 1.7.6 with
xorg-x11-drv-ati-6.13.0-0.21.20100219gite68d3a389.fc12.x86_64, Kernel
2.6.32.11-99.fc12.x86_64 using KMS.


The tests which have regressed and are the most critical (and the focus of this
bug report) are:

WORSE -95% CRITICAL REGRESSION
6.8.2:     900 reps @   5.7020 msec (   175.0/sec): Scroll 500x500 pixels
1.7.6:      50 reps @ 108.3004 msec (     9.2/sec): Scroll 500x500 pixels

WORSE -42% CRITICAL REGRESSION
6.8.2:    1200 reps @   5.3795 msec (   186.0/sec): Copy 500x500 from pixmap to
window 
1.7.6:     800 reps @   9.2924 msec (   108.0/sec): Copy 500x500 from pixmap to
window

WORSE -95% CRITICAL REGRESSION
6.8.2:    1200 reps @   5.4315 msec (   184.0/sec): Copy 500x500 from window to
pixmap 
1.7.6:      80 reps @ 109.8940 msec (     9.1/sec): Copy 500x500 from window to
pixmap

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