[Bug 250323] OpenZFS L2ARC size shrinking over time
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Date: Thu, 17 Nov 2022 18:07:52 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250323
John F. Carr <jfc@mit.edu> changed:
What |Removed |Added
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CC| |jfc@mit.edu
--- Comment #4 from John F. Carr <jfc@mit.edu> ---
I see this on two systems running 13.1-STABLE but can not confirm any effect on
performance. Try doing a small I/O and running "sync" for a more controlled
test. Running "sync" causes the decrease to appear sooner than it ordinarily
would. I recall that ZFS likes to merge writes on a time scale of several
seconds.
In the openzfs code the sysctl variable "l2_asize" is the struct field
arc_stats_t.
arcstat_l2_psize. This is more obscure than it ought to be.
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