[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

            Bug ID: 221974
           Summary: cam iosched: The iops limiter should enforce limits
                    below the quanta value and should not discard
                    'unspent' ios
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: fk at fabiankeil.de
             Flags: mfc-stable11?

Created attachment 185971
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=185971&action=edit
cam iosched: Enforce iop limits below the quanta value and preserve "unspent"
ios

Currently the iops limiter allows at least one iop per tick, as a result
limits below the quanta value aren't enforced.

ios that aren't used between ticks are lost, as a result the iops limiter
can enforce a limit significantly below the configured maximum.

The attached patch set fixes both issues.

Obtained from: ElectroBSD

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