Quoting Alexander Leidinger (from Fri, 22
Apr 2022 09:04:39 +0200):
Quoting Doug Ambrisko (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 via
I 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.
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