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From: Borja Marcos <borjam@sarenet.es>
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Subject: Crazy default kern.maxusers?
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Hi :)

I am setting an Elasticsearch cluster using FreeBSD 12-STABLE. The =
servers have 64 GB of memory and I am running ZFS.=20

I was puzzled when despite having limited vfs.zfs.arc_max to 32 GB and =
assigning a 16 GB heap (locked) to Elasticsearch,
and with around 10 GB of free memory, I saw the system hitting swap and =
actively paging in and out.=20

Should it happen?=20

Checking sysctl values I noticed that kern.maxusers was 4429!

Is this sane? I have decreased it to 32 on boot.loader.conf and I am =
checking wether it behaves the same.

Thanks!




Borja.