Quoting Doug Ambrisko <ambri...@ambrisko.com> (from Thu, 21 Apr 2022 09:38:35 -0700):
I've attached mount.patch that when doing mount -v should show the vnode usage per filesystem. Note that the problem I was running into was after some operations arc_prune and arc_evict would consume 100% of 2 cores and make ZFS really slow. If you are not running into that issue then nocache etc. shouldn't be needed.I don't run into this issue, but I have a huge perf difference when using nocache in the nightly periodic runs. 4h instead of 12-24h (22 jails on this system).On my laptop I set ARC to 1G since I don't use swap and in the past ARC would consume to much memory and things would die. When the nullfs holds a bunch of vnodes then ZFS couldn't release them. FYI, on my laptop with nocache and limited vnodes I haven't run into this problem. I haven't tried the patch to let ZFS free it's and nullfs vnodes on my laptop. I have only tried it viaI have this patch and your mount patch installed now, without nocache and reduced arc reclaim settings (100, 1). I will check the runtime for the next 2 days.
9-10h runtime with the above settings (compared to 4h with nocache and 12-24h without any patch and without nocache). I changed the sysctls back to the defaults and will see in the next run (in 7h) what the result is with just the patches.
Bye, Alexander. -- http://www.Leidinger.net alexan...@leidinger.net: PGP 0x8F31830F9F2772BF http://www.FreeBSD.org netch...@freebsd.org : PGP 0x8F31830F9F2772BF
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