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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Wed Jan 23 2002 - 21:00:44 EST