Messages in this thread |  | | | Date | Sun, 13 Nov 2005 08:17:16 +0100 | | From | Ingo Molnar <> | | Subject | Re: ia64 SN2 - migration costs: 1) nearly zero 2) BUG 3) repeated |
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* Paul Jackson <pj@sgi.com> wrote:
> I turned on migration_debug=3 at boot, enabled CONFIG_PREEMPT and some > other CONFIG DEBUG options, and captured the output from the tty > console instead of via the /var/log/messages file. This resulted in > the following. Now I don't see the BUG, and the cost matrix makes > more sense (not all 0's), and the matrix output is not repeated. I > don't understand why. Feel free to ask me to try various > combinations, Ingo, if this doesn't make sense to you either.
hm, these calibration results looks quite sane. Could you try migration_debug=3 with the .config that failed before? (if it doesnt fail, could you re-check it still fails with migration_debug=2?) Zero results in the cost matrix usually are a sign of time resolution problems - but that shouldnt be an issue on ia64 which should have a globally synced TSC, right?
until these problems are solved, you should be able to work around it by booting with the migration_cost=0,7512036,45850376 boot option.
you can work around the warning message via changing the:
int cpu1 = -1, cpu2 = -1, cpu, orig_cpu = smp_processor_id();
line to:
int cpu1 = -1, cpu2 = -1, cpu, orig_cpu = raw_smp_processor_id();
i'll do the correct fix.
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