Re: Speed improvements in ZFS

From: Alexander Leidinger <Alexander_at_Leidinger.net>
Date: Tue, 15 Aug 2023 19:33:34 UTC 
Am 2023-08-15 14:41, schrieb Mateusz Guzik:

> With this in mind can you provide: sysctl kern.maxvnodes
> vfs.wantfreevnodes vfs.freevnodes vfs.vnodes_created vfs.numvnodes
> vfs.recycles_free vfs.recycles

After a reboot:
kern.maxvnodes: 10485760
vfs.wantfreevnodes: 2621440
vfs.freevnodes: 24696
vfs.vnodes_created: 1658162
vfs.numvnodes: 173937
vfs.recycles_free: 0
vfs.recycles: 0

> Meanwhile if there is tons of recycles, you can damage control by
> bumping kern.maxvnodes.

Looks like there are not much free directly after the reboot. I will 
check the values tomorrow after the periodic run again and maybe 
increase by 10 or 100 so see if it makes a difference.

> If this is not the problem you can use dtrace to figure it out.

dtrace-count on vnlru_read_freevnodes() and vnlru_free_locked()? Or 
something else?

Bye,
Alexander.

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