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From: Peter <pmc@citylink.dinoex.sub.org>
Subject: 11.1-RELEASE: huge amount of l2_cksum_bad
Date: Fri, 28 Jul 2017 15:18:10 +0200
Organization: even some more stinky socks
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After upgrading 11.0-RELEASE-p10 to 11.1-RELEASE I suddenly see a huge 
amount of kstat.zfs.misc.arcstats.l2_cksum_bad (nearly 2% of 
kstat.zfs.misc.arcstats.l2_hits).

I have set
 > vfs.zfs.compressed_arc_enabled="0"
in loader.conf. When removing this, the errors are gone. It seems that 
option is not working well in 11.1-RELEASE.