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[Bug 579932] Kernel stops waking sleeping tasks when running a sleeping task. Resumes on user input. Workaround: clocksource=jiffies
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Wed, 1 Sep 2010 21:28:26 +0000
  • Message-id: <20100901212826.4A093245523@xxxxxxxxxxxxxxxxxxxxxx>

https://bugzilla.novell.com/show_bug.cgi?id=579932

https://bugzilla.novell.com/show_bug.cgi?id=579932#c20


--- Comment #20 from Jiri Slaby <jslaby@xxxxxxxxxx> 2010-09-01 21:28:24 UTC ---
(In reply to comment #19)
Good news! Quick testing of 2.6.35.3:
- clocksource=jiffies _completely_ did the trick!!!
- clocksource=nolapic_timer did not, although the hangs were less frequent.

nolapic_timer is a standalone parameter. Try without "clocksource=". What is
you clocksource anyway (dmesg|grep clock should tell)? If it is tsc, you may
also try clocksource=hpet to have high precision timers.

Specifically, with clocksource=jiffies:
..
- On the downside, rt-benchmark was no longer schedulable if intervals were
shorter than about 0.001 seconds.

Which is expected when HZ is set to 1000 HZ (jiffies are updated in this
frequency).

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