[Bug 31635] New: Bad performance of 64-bit compilation compared to 32-bit.

[Bug 31635] New: Bad performance of 64-bit compilation compared to 32-bit.

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=31635

           Summary: Bad performance of 64-bit compilation compared to
                    32-bit.
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r300
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: drill87@gmail.com


I've got archlinux 64-bit system with chrooted archlinux 32-bit in it. 
Video card: ATI X1270 (RS690)
Kernel version: 2.6.35
Xorg server version: 1.9.0

I've compiled r300g both for 32-bit and 64-bit systems with parameters:
  --prefix=/usr --enable-glx-tls --disable-egl --enable-gallium-radeon
--with-dri-driverdir=/usr/lib/xorg/modules/dri --with-dri-drivers="radeon,r300"
--with-state-trackers="glx,dri"

After tests I found, that in 32-bit r300g gives 860 fps in glxgears, whereas
64-bit version only 250. I also compared framerate in 3D action game Tremulous,
which has precompiled binaries for both 32-bit and 64-bit linux - the result
was similar: I've got 38 fps in 32-bit version and only 18 fps in 64-bit in
same scene.

Unfortunately, I'm not sure if this is a real bug or just a bad optimization of
64-bit version - I couldn't find any specific information about that...

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[Bug 31635] [r300g]Bad performance of 64-bit compilation compared to 32-bit.

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=31635

Drill <drill87@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Bad performance of 64-bit   |[r300g]Bad performance of
                   |compilation compared to     |64-bit compilation compared
                   |32-bit.                     |to 32-bit.

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[Bug 31635] [r300g]Bad performance of 64-bit compilation compared to 32-bit.

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=31635

--- Comment #1 from Roland Scheidegger <sroland@vmware.com> 2010-11-15 12:51:46 PST ---
There are a couple of asm optimizations which are only available on 32bit and
not not 64bit (or some of them only on 64bit with 3dnow). Your gpu doesn't
support hw TCL so this could maybe make a difference. But gallium drivers
shouldn't really be affected by this. Some profiling data might help possibly.

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[Bug 31635] [r300g]Bad performance of 64-bit compilation compared to 32-bit.

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=31635

--- Comment #2 from Marek Olšák <maraeo@gmail.com> 2010-11-15 13:16:47 PST ---
I thought we had SSE2 vertex shaders for 64-bit too, but apparently it's
disabled. I won't investigate further because there is also LLVM. Can you
recompile mesa with --enable-gallium-llvm? It should make everything a lot
faster for you.

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[Bug 31635] [r300g]Bad performance of 64-bit compilation compared to 32-bit.

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=31635

--- Comment #3 from Drill <drill87@gmail.com> 2010-11-15 23:46:59 PST ---
Thank you, enabling llvm helped very much. Sorry for bothering you for (as it
seems) nothing.

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[Bug 31635] [r300g]Bad performance of 64-bit compilation compared to 32-bit.

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=31635

Drill <drill87@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |NOTABUG

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