[Bug 221953] cam iosched: Limit the quanta default to hz if it's below 200

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221953

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: imp
Date: Tue Sep 12 23:46:33 UTC 2017
New revision: 323511
URL: https://svnweb.freebsd.org/changeset/base/323511

Log:
  cam iosched: Limit the quanta default to hz if it's below 200

  The cam_iosched_ticker() can't be scheduled more than once per tick.
  Some limiters depend on quanta matching the number of calls per second
  to enforce the proper limits. Limit the quanta to no faster than 1 per
  clock tick. This fixes some features when running in VMs where the
  default HZ is 100.

  PR: 221953
  Obtained from: ElectroBSD
  Differential Revision: https://reviews.freebsd.org/D12337
  Submitted by: Fabian Keil

Changes:
  head/sys/cam/cam_iosched.c

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