Opened 17 years ago
Closed 17 years ago
Last modified 17 years ago
#3800 closed enhancement (invalid)
mythbackend and mythwelcome wakeup a lot
Reported by: | anonymous | Owned by: | Isaac Richards |
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Priority: | minor | Milestone: | unknown |
Component: | mythtv | Version: | 0.20-fixes |
Severity: | medium | Keywords: | wakeup idle loop sleep |
Cc: | Ticket locked: | no |
Description
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.
Change History (3)
comment:1 Changed 17 years ago by
comment:2 Changed 17 years ago by
Resolution: | → invalid |
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Status: | new → closed |
Enhancement ticket's need to have a patch attached, and this doesn't qualify as a defect. Thanks for collecting this data, if you post it to the developer mailing list it may trigger some discussion. MythWelcome? appears to waking up surprisingly often.
Hmm, I tried to enter my email address on the report, but it didn't take. This comment should include it now.