[Bug 26558] New: KMS Kills 3D performance with Linux-2.6.33>rc6

[Bug 26558] New: KMS Kills 3D performance with Linux-2.6.33>rc6

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=26558

           Summary: KMS Kills 3D performance with Linux-2.6.33>rc6
           Product: DRI
           Version: unspecified
          Platform: Other
               URL: http://www.phoronix.com/forums/showthread.php?t=21930
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.sourceforge.net
        ReportedBy: lmilano@gmx.net


I am testing the Radeon open source stack with the Kubuntu Lucid (10.04)
current packages. Up to 2.6.33rc6, 3D performance has been good (3D games would
be playable). Starting with rc7, 3D performance is gone: 3D games get less than
a frame per second, even scrolling the mouse pointer is painfully slow. 

It appears that KMS was not working up until rc6, and it started working in
rc7. Disabling KMS in rc7 or rc8 solves the performance issue. This could be a
kernel regression, or a problem with KMS in my graphics stack. I'll post more
detailed info below.

Software:

Display Server: X.Org Server 1.7.3.902 (1.7.4 RC 2)
Display Driver: radeon 6.12.99
Kernel: 2.6.33rc7 64bit (from Ubuntu's mainline ppa)

Hardware: 

Radeon HD 3450
AMD Phenom X3


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[Bug 26558] KMS Kills 3D performance with Linux-2.6.33>rc6

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=26558





--- Comment #1 from Leo Milano <lmilano@gmx.net>  2010-02-13 11:32:42 PST ---
Created an attachment (id=33279)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33279)
dmesg, 2.6.33-rc6


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[Bug 26558] KMS Kills 3D performance with Linux-2.6.33>rc6

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=26558





--- Comment #2 from Leo Milano <lmilano@gmx.net>  2010-02-13 11:33:20 PST ---
Created an attachment (id=33280)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33280)
dmesg, 2.6.33-rc7


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[Bug 26558] KMS Kills 3D performance with Linux-2.6.33>rc6

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=26558





--- Comment #3 from Leo Milano <lmilano@gmx.net>  2010-02-13 11:34:26 PST ---
Created an attachment (id=33281)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33281)
xorg log 2.6.33-rc6


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[Bug 26558] KMS Kills 3D performance with Linux-2.6.33>rc6

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=26558





--- Comment #4 from Leo Milano <lmilano@gmx.net>  2010-02-13 11:35:22 PST ---
Created an attachment (id=33282)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=33282)
xorg log 2.6.33-rc7


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[Bug 26558] KMS Kills 3D performance with Linux-2.6.33>rc6

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=26558


Leo Milano <lmilano@gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lmilano@gmx.net




--- Comment #5 from Leo Milano <lmilano@gmx.net>  2010-02-13 11:43:04 PST ---
Not the following line in the xorg log when I boot with rc6: 
(II) [KMS] drm report modesetting isn't supported.

In contrast, with rc7 I get this:
(II) [KMS] Kernel modesetting enabled.

As indicated in the bug report summary, if I add nomodeset and radeon.modeset=0
as a command line option, 3D performance with rc7 is the same as with rc6
(quite acceptable). 


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[Bug 26558] KMS Kills 3D performance with Linux-2.6.33>rc6

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=26558


Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #33281|text/x-log                  |text/plain
          mime type|                            |
  Attachment #33281|0                           |1
           is patch|                            |




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[Bug 26558] KMS Kills 3D performance with Linux-2.6.33>rc6

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=26558


Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #33282|text/x-log                  |text/plain
          mime type|                            |
  Attachment #33282|0                           |1
           is patch|                            |




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[Bug 26558] KMS Kills 3D performance with Linux-2.6.33>rc6

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=26558


Alex Deucher <agd5f@yahoo.com> changed:

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




--- Comment #6 from Alex Deucher <agd5f@yahoo.com>  2010-02-13 12:03:46 PST ---
Performance is slow because acceleration is disabled.  You need to install the
rlc firmware:

[   38.055612] r600_cp: Failed to load firmware "radeon/R600_rlc.bin"
[   38.055661] [drm:r600_startup] *ERROR* Failed to load firmware!

You can get it here:
http://people.freedesktop.org/~agd5f/radeon_ucode/

Put it in /lib/firmware/radeon or where ever your distro stores firmware.


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[Bug 26558] KMS Kills 3D performance with Linux-2.6.33>rc6

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http://bugs.freedesktop.org/show_bug.cgi?id=26558





--- Comment #7 from Leo Milano <lmilano@gmx.net>  2010-02-13 12:18:58 PST ---
Alex, thank you very much for the pointer. I will test that. Does this mean
that this firmware is only needed when using KMS ?


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[Bug 26558] KMS Kills 3D performance with Linux-2.6.33>rc6

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--- Comment #8 from Leo Milano <lmilano@gmx.net>  2010-02-13 13:02:07 PST ---
Thank you again, Alex, and sorry for reporting a non-bug.

For the record, and for the benefit of other people: the location for the
firmware in Ubuntu is: 

/lib/firmware/KERNEL_VERSION/radeon

For example:

leo@grisell:/lib/firmware/2.6.33-020633rc8-generic/radeon$ ls
R100_cp.bin  R300_cp.bin  R520_cp.bin  R600_pfp.bin  R700_rlc.bin  RS690_cp.bin
 RS780_pfp.bin  RV610_pfp.bin  RV620_pfp.bin  RV630_pfp.bin  RV635_pfp.bin 
RV670_pfp.bin  RV710_pfp.bin  RV730_pfp.bin  RV770_pfp.bin
R200_cp.bin  R420_cp.bin  R600_me.bin  R600_rlc.bin  RS600_cp.bin  RS780_me.bin
 RV610_me.bin   RV620_me.bin   RV630_me.bin   RV635_me.bin   RV670_me.bin  
RV710_me.bin   RV730_me.bin   RV770_me.bin

Note that the Rxxxx_rlc.bin seem to be only required when using KMS, and are
not currently provided with the kernel mainline ppa (all the other ones are).
Also: performance seems to be better without KMS these days -- I get about 16
fps in WoP without KMS, and 20 with KMS, please see here:

http://global.phoronix-test-suite.com/index.php?k=profile&u=mendieta-28641-25051-25186


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[Bug 26558] KMS Kills 3D performance with Linux-2.6.33>rc6

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http://bugs.freedesktop.org/show_bug.cgi?id=26558





--- Comment #9 from Alex Deucher <agd5f@yahoo.com>  2010-02-13 14:35:13 PST ---
The RLC firmware is required for the interrupt controller which is only used by
KMS, so it's only required for KMS.


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