[mythtv-commits] Ticket #3800: mythbackend and mythwelcome wakeup a lot

[MythTV]

#3800: mythbackend and mythwelcome wakeup a lot
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 Reporter:  anonymous    |       Owner:  ijr       
     Type:  enhancement  |      Status:  new       
 Priority:  minor        |   Milestone:  unknown   
Component:  mythtv       |     Version:  0.20-fixes
 Severity:  medium       |     Mlocked:  0         
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 Running mythtv 0.20.1-161 (RPMs from ATrpms) on Fedora 7. Using powertop,
 I have found that on an idle system, mythwelcome and mythbackend wakeup
 very frequently from what appears to be polling loops with short sleeps.
 mythfrontend isn't running.

 Here is some data from power top. The % gives you the % of total wakeups
 that process/event is responsible for, the number in parens is the number
 of wakeups per second that process/event is responsible for.

 43.8% (170.4)       mythwelcome : schedule_timeout (process_timeout)

 26.3% (102.2)       mythbackend : schedule_timeout (process_timeout)

 19.5% ( 75.6)       <interrupt> : ivtv0, nvidia

 5.1% ( 20.0)       mythbackend : futex_wait (hrtimer_wakeup)

 0.9% (  3.5)            wmaker : schedule_timeout (process_timeout)

 0.9% (  3.4)                 X : do_setitimer (it_real_fn)

 Reducing the number of wakeups will reduce power consumption slightly on
 all machines, but it is especially noticable on hardware which supports
 lower CPU C-states.

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Ticket URL: <http://svn.mythtv.org/trac/ticket/3800>
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