[Bug 33512] New: radeon: lots of time spent in atombios_crtc_disable

bugzilla-daemon at bugzilla.kernel.org bugzilla-daemon at bugzilla.kernel.org
Sun Apr 17 13:41:22 PDT 2011


           Summary: radeon: lots of time spent in atombios_crtc_disable
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.39-rc3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri at kernel-bugs.osdl.org
        ReportedBy: edwintorok at gmail.com
        Regression: No

Created an attachment (id=54532)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=54532)

On a mostly idle system this is what I see with perf top (after exiting a
   PerfTop:     386 irqs/sec  kernel:72.8%  exact:  0.0% [1000Hz cycles], 
(all, 6 CPUs)

             samples  pcnt function                       DSO
             _______ _____ ______________________________ 
              171.00 18.0% atombios_crtc_disable         
               47.00  4.9% find_next_bit                  [kernel.kallsyms]     
               31.00  3.3% format_decode                  [kernel.kallsyms]     

When playing a game that function is still on top, albeit with a lower
percentage (7.5%).
If the function does what its name says then it should be called at most once,
when switching modes, entering standby, etc. I don't see why it is being called
during normal operation, and why is it called so many times that it makes it
the top function using the CPU...

The graphics in games is quite laggy too, maybe because of this...

My dmesg is attached.

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