[haiku-bugs] Re: [Haiku] #11685: CPU load spikes affecting performance introduced in hrev46690

  • From: "diver" <trac@xxxxxxxxxxxx>
  • Date: Fri, 02 Jan 2015 04:01:45 -0000

#11685: CPU load spikes affecting performance introduced in hrev46690
-----------------------------+----------------------------
   Reporter:  jstressman     |      Owner:  pdziepak
       Type:  bug            |     Status:  assigned
   Priority:  normal         |  Milestone:  R1
  Component:  System/Kernel  |    Version:  R1/Development
 Resolution:                 |   Keywords:
 Blocked By:                 |   Blocking:
Has a Patch:  0              |   Platform:  All
-----------------------------+----------------------------
Description changed by diver:

Old description:

> Up to and including hrev46689 my system would idle at almost flatline.
> Between 0 and 2% or so on any core. But starting with Pawel's changes in
> hrev46690 my CPUs will randomly spike to almost full load every few
> seconds, for anywhere from a fraction of a second to a couple seconds,
> during which time the system basically partially freezes. You can usually
> move the mouse, but the menus are frozen, displays like the
> ActivityMonitor freeze and then jump ahead when it unfreezes (which
> you'll see as the jagged sawtooth pattern on the screenshot).
>
> I'd noticed this a few days ago when I finally updated my system from
> hrev46677, which was the last normal nightly release that worked for me.
> While trying to track down another boot problem that was introduced
> between that and the next nightly, I noticed that this issue was
> introduced in the same revision.

New description:

 Up to and including hrev46689 my system would idle at almost flatline.
 Between 0 and 2% or so on any core. But starting with Pawel's changes in
 hrev46690 my CPUs will randomly spike to almost full load every few
 seconds, for anywhere from a fraction of a second to a couple seconds,
 during which time the system basically partially freezes. You can usually
 move the mouse, but the menus are frozen, displays like the
 ActivityMonitor freeze and then jump ahead when it unfreezes (which you'll
 see as the jagged sawtooth pattern on the screenshot).

 I'd noticed this a few days ago when I finally updated my system from
 hrev46677, which was the last normal nightly release that worked for me.
 While trying to track down another boot problem that was introduced
 between that and the next nightly, I noticed that this issue was
 introduced in the same revision.

 [[Image(screenshot1crop.png​)]]
 [[Image(screenshot4crop.png)]]

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Ticket URL: <https://dev.haiku-os.org/ticket/11685#comment:3>
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