Baptiste Daroussin 91f1caeccb Add sysctls for arc shrinking and growing values
The default value for arc_no_grow_shift may not be optimal when using
several GiB ARC. Expose it via sysctl allows users to tune it easily.

Also expose arc_grow_retry via sysctl for the same reason. The default value of
60s might, in case of intensive load, be too long.

Submitted by:	Nikita Kozlov <nikita.kozlov@blade-group.com>
Reviewed by:	mav, manu, bapt
MFC after:	2 weeks
Sponsored by:	blade
Differential Revision:	https://reviews.freebsd.org/D12144
2017-08-31 13:02:17 +00:00
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