Hi David, > Well, that seems to be it, but not quite with the same symptoms you > observed. khugepaged never showed up, and "perf top" never revealed > _spin_lock_irqsave.
Ah, very interesting. Reading the thread, I was thinking about this, but the symptoms I've seen in the past quite didn't match yours (khugepaged was a big red flag in my case). So, as I suggested on James' blog, to make things even better, you can choose to enable huge pages defragmentation only for applications that explicitly want to use hugepages (with MADV_HUGEPAGE). # echo madvise > /sys/kernel/mm/transparent_hugepage/defrag See https://www.kernel.org/doc/Documentation/vm/transhuge.txt for details. Cheers, -- Kilian _______________________________________________ Beowulf mailing list, [email protected] sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
