[Bug 237807] ZFS: ZVOL writes fast, ZVOL reads abysmal...

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237807

--- Comment #5 from Nils Beyer <nbe at renzel.net> ---
(In reply to crest from comment #4)

with "primarycache=metadata" and "secondarycache=none" much much better...
Factor ten; get around 200MB/s now (no joke) with one single "dd".

With two "dd" instances, I get around 400MB/s.


What is the logic behind that "primarycache=metadata" is actually more
performant than "primarycache=all"?

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