[haiku-bugs] Re: [Haiku] #10454: New scheduler: substantial performance drop
- From: "fishpond" <trac@xxxxxxxxxxxx>
- Date: Sun, 29 Jun 2014 16:09:32 -0000
#10454: New scheduler: substantial performance drop
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Reporter: stippi | Owner: pdziepak
Type: task | Status: in-progress
Priority: high | Milestone: R1
Component: System/Kernel | Version: R1/Development
Resolution: | Keywords:
Blocked By: 10487 | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by fishpond):
The scheduling keeps my core I7 quad system unusable for any sort of media
processing or games with sound. Around 20 seconds after booting up, menu
navigation becomes unresponsive. Really looks as if especially small tasks
get delayed for multiple seconds sometimes, including audio buffer
transfers, keyboard and mouse click responses etc.. Building Haiku in
parallel or other batch tasks with single-threaded parallel processes fly
though.
Pretty sure I spotted one bug in scheduler.cpp -
scheduler_set_thread_priority, line 184ff. where the test on the new
priority being different to the current on occurs after the new on is set,
so that the priority update never really happens.
Will look into other points but that should probably be fixed, simply by
checking against oldPriority instead of thread->priority in line 184.
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Ticket URL: <https://dev.haiku-os.org/ticket/10454#comment:18>
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