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From Takenori Sato <>
Subject /proc/sys/vm/zone_reclaim_mode
Date Tue, 10 Sep 2013 03:50:23 GMT

I am investigating NUMA issues.

I have been aware that bin/cassandra tries to use interleave all policy if

So what about /proc/sys/vm/zone_reclaim_mode? Any recommendations? I didn't
find any in respect to Cassandra.

By default on Linux NUMA machine, this is set 1 that tries to reclaim some
pages in a zone rather than acquiring others from the other zones.

Explicitly disabling this sounds better.

"It may be beneficial to switch off zone reclaim if the system is used for
a file server and all of memory should be used for caching files from disk.
In that case the caching effect is more important than data locality."


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