[evan_miller]

Have you tried disabling only defrag? The performance issues I'm familiar with are generally related to defrag running at allocation time. I would be curious to see your results while enabling THP but:

echo never > /sys/kernel/mm/transparent_hugepage/defrag

[antirez]

Awesome hint, I'll try it. However if huge pages means 2MB copy-on-write for each fault, you want still them turned off for Redis. Also does not help with jemalloc memory reclaiming.