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Subject: [Bug 221953] cam iosched: Limit the quanta default to hz if it's
 below 200
Date: Thu, 31 Aug 2017 10:14:21 +0000
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X-Bugzilla-Component: kern
X-Bugzilla-Version: CURRENT
X-Bugzilla-Keywords: patch
X-Bugzilla-Severity: Affects Some People
X-Bugzilla-Who: fk@fabiankeil.de
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D221953

            Bug ID: 221953
           Summary: cam iosched: Limit the quanta default to hz if it's
                    below 200
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: fk@fabiankeil.de
             Flags: mfc-stable11?

Created attachment 185945
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D185945&action=
=3Dedit
cam iosched: Limit the quanta default to hz if it's below 200

The attached patch limits the quanta default to hz if it's below 200

Previously the quanta default was always 200 while hz defaults
to 100 when running in a vm.

The cam_iosched_ticker() can't be scheduled more than once per tick
and some of the limiters depend on quanta matching the number of calls
per second to enforce the proper limits.

Obtained from: ElectroBSD

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