Messages in this thread | | | Date | Mon, 21 Jan 2002 15:38:07 +0100 (CET) | From | Ingo Molnar <> | Subject | Re: Boot hang in 2.5.3-pre2 |
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On Mon, 21 Jan 2002, Dave Jones wrote:
> > Hi, Linus. FYI: 2.5.3-pre2 hangs during boot. The last couple of > > messages I get are: > > Based upon Swansea University Computer Society NET3.039 > > apm: BIOS version 1.2 Flags 0x03 (Driver version 1.15) > > apm: disabled - APM is not SMP safe (power off active). > > Ingo's scheduler patches solved this one for me (and others).
the bug is the following: the 2.5.3-pre2 kernel in essence includes the -I3 patch. The -I3 scheduler doesnt have the task migration fixes yet, but has the improved load-balancer. And exactly this improved load-balancer makes task-migration much more likely to happen during bootup => triggering it for ksoftirqd migration, resulting in a hang.
older versions had the migration bug as well, but the first iteration of the load-balancer was much less accurate at balancing runqueues, so it didnt trigger the bug.
Ingo
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