[Bug 773770] rtpjitterbuffer: high CPU usage with low latency audio

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773770

--- Comment #4 from Petr Kulhavy <brain at jikos.cz> ---
Here some cache statistics:
UC1 (udpsrc)

 Performance counter stats for process id '738':

       5661.705299      task-clock (msec)         #    0.708 CPUs utilized      
             33199      context-switches          #    0.006 M/sec              
                 0      cpu-migrations            #    0.000 K/sec              
                 0      page-faults               #    0.000 K/sec              
        2636575647      cycles                    #    0.466 GHz               
      (63.44%)
   <not supported>      stalled-cycles-frontend  
   <not supported>      stalled-cycles-backend   
         104954645      instructions              #    0.04  insns per cycle   
      (62.53%)
          13825670      branches                  #    2.442 M/sec             
      (62.11%)
           6442396      branch-misses             #   46.60% of all branches   
      (61.54%)
          42112109      L1-dcache-loads           #    7.438 M/sec             
      (62.13%)
           4642094      L1-dcache-load-misses     #   11.02% of all L1-dcache
hits    (50.35%)
          28051277      LLC-loads                 #    4.955 M/sec             
      (50.64%)
           9292795      LLC-load-misses           #   33.13% of all LL-cache
hits     (50.77%)

       7.998025020 seconds time elapsed

-----
And UC2 (no udpsrc)

 Performance counter stats for process id '799':

       6215.619905      task-clock (msec)         #    0.689 CPUs utilized      
             44273      context-switches          #    0.007 M/sec              
                 0      cpu-migrations            #    0.000 K/sec              
                 0      page-faults               #    0.000 K/sec              
        2832839267      cycles                    #    0.456 GHz               
      (54.66%)
   <not supported>      stalled-cycles-frontend  
   <not supported>      stalled-cycles-backend   
         240020862      instructions              #    0.08  insns per cycle   
      (62.25%)
          27402150      branches                  #    4.409 M/sec             
      (66.28%)
           9297390      branch-misses             #   33.93% of all branches   
      (57.62%)
          82000459      L1-dcache-loads           #   13.193 M/sec             
      (53.71%)
           6656276      L1-dcache-load-misses     #    8.12% of all L1-dcache
hits    (48.78%)
          37442118      LLC-loads                 #    6.024 M/sec             
      (54.09%)
          10521617      LLC-load-misses           #   28.10% of all LL-cache
hits     (57.52%)

       9.023314498 seconds time elapsed

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