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as a followup, I don't see large latency with huge pages, but I have kernel samepage merging disabled.

I would be interested if this also decreases latency for you:

echo 2 > /sys/kernel/mm/ksm/run

Also check stats here: /sys/kernel/mm/ksm/*

And some documentation here: https://www.kernel.org/doc/Documentation/vm/ksm.txt



Strange... you should definitely see it if you are using jemalloc now that it's clear it's about mass-COW.


I do see it now... wasn't testing right before. Goes away as you say when disabling transparent THP. KSM has no effect, contrary to what I thought earlier.


Thanks a lot for independent confirmation of the issue.




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