[Bug 221974] cam iosched: The iops limiter should enforce limits below the quanta value and should not discard 'unspent' ios

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221974

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: imp
Date: Fri Sep 22 02:36:32 UTC 2017
New revision: 323893
URL: https://svnweb.freebsd.org/changeset/base/323893

Log:
  cam iosched: Enforce iop limits below the quanta value

  Previously the iops limiter would always allow at least
  quanta ios per second as cam_iosched_iops_tick() never set
  ios->l_value1 below 1.

  Submitted by: Fabian Keil <fk at fabiankeil.de>
  Obtained from: ElectroBSD
  PR: 221974

Changes:
  head/sys/cam/cam_iosched.c

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