On 2019-02-08 10:27, Alexander Leidinger wrote:

I recently noticed some generic slowness myself. I experienced this during replacing disks in a raidz by bigger ones. Long story short, check top -s if you have vnlru running for a long period at high CPU... If yes increase kern.maxvnodes (I increased to 10 times). Note, we should improve the admin page in the FAQ, the vnlru entry could need a little bit more hints and explanations.

If you encounter the same issue we have probably introduced a change somewhere with an unintended side effect.


I'm seeing this as well, on 13-CURRENT. I updated a computer from the last January snapshot (30 or 31 of January, I can't remember) and it seems disk IO is very slow. I remember having a svn checkout taking a very long time, with the SVN process pegged at 100% according to top. I can't see the vnlru process running though, but I haven't looked closely, and I haven't tried the maxvnodes workaround. Something has changed though. This is systems using ZFS, both mirror and single disk. Gstat shows disks are mostly idle.

I know this is a lousy bug report, but this, and the feeling that things are slower than usual, is what I have for now.
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