http://defect.opensolaris.org/bz/show_bug.cgi?id=3098
Summary: Deep C-State must meet Real Time thread requirements
Classification: Development
Product: power-mgmt
Version: unspecified
Platform: Other
OS/Version: Solaris
Status: NEW
Severity: minor
Priority: P3
Component: c-state
AssignedTo: bill.holler at sun.com
ReportedBy: bill.holler at sun.com
CC: tesla-dev at opensolaris.org
Estimated Hours: 0.0
Deep C-state support will add a wakeup latency to idle CPUs.
This latency must not be so large it breaks RT requirements.
What is the RT requirement?
I might be possible processor performance has increased enough since any
RT requirement was made that even CPUs comming out of Deep C-state meet
the requirement?
Multiple possible solutions exist.
1. Disable Deep C-states when the RT scheduling class is loaded.
2. Schedule a CPU to wakeup from Deep C-state some time ahead of when a
RT callout will expire.
3. Schedule RT threads on groups of CPUs that do not enter Deep C-states
while other CPU groups are allowed to.
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