[haiku-bugs] Re: [Haiku] #10454: New scheduler: substantial performance drop
- From: "pdziepak" <trac@xxxxxxxxxxxx>
- Date: Wed, 05 Feb 2014 14:02:00 -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 pdziepak):
Well, thread migration definitely is not working properly when it has to
deal with a large amount of short lived tasks. hrev46810 contains only
work toward fixing that issue not a complete fix. Also, the fact that none
of the cores reaches 100% load in a half-second average doesn't tell much
what is really happening there. The scheduler operates on much shorter
time intervals. I have several patches that help to mitigate this thread
migration problem and I will push at least some of them later today.
"Short freezes" are rather more worrying issue. Are they system-wide or
affect just one application? Or perhaps only mouse/keyboard input is
affected? If you can enter KDL during one of such freezes it would be
interesting to see if there are any running or ready threads, how they are
assigned to cores and how cores are ranked (useful commands: "running",
"ready", "run_queue", "cpu_heap").
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Ticket URL: <https://dev.haiku-os.org/ticket/10454#comment:10>
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