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@FreeBSD.org
Reporter: f...@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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