[Bug 250323] OpenZFS L2ARC size shrinking over time

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250323

--- Comment #5 from Graham Perrin <grahamperrin@freebsd.org> ---
Created attachment 239168
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=239168&action=edit
Screenshot: Netdata, one month, HP EliteBook 8570p with L2ARC across two
low-end USB thumb drives

(In reply to Stefan Eßer from comment #0)

> … there might be a wrap-around after several weeks of up-time, …

I never looked (with my local-only installation of Netdata
<https://www.freshports.org/net-mgmt/netdata/>) at a period longer than one
month. 14.0-CURRENT here. 

For what it's worth: over the past year or so I have looked often enough, at
periods involving a few days of uptime, to _not_ suspect a bug affecting
longer-term uptimes. 

Still, maybe worth investigating. 

Do check upstream, <https://github.com/openzfs/zfs/>.

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