[Bug 221953] cam iosched: Limit the quanta default to hz if it's below 200
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Thu Aug 31 10:14:21 UTC 2017
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221953
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 at FreeBSD.org
Reporter: fk at fabiankeil.de
Flags: mfc-stable11?
Created attachment 185945
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=185945&action=edit
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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