https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192316
Bug ID: 192316
Summary: Invariant TSC gets misdetected on Intel Core 2 Duo
processors, resulting in sluggish system behavior
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: Needs Triage
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Hi,
On this Intel Core 2 Duo T6570 processor, the TSC timer gets a very high
priority, even though it is not invariant. If there is power saving enabled and
the processor goes to lower C-states, this results in a sluggish system.
Thread on freebsd-current:
https://lists.freebsd.org/pipermail/freebsd-current/2014-July/051498.html
There are some Intel models hard coded as TSC invariant in the TSC detection
logic, even if they are not. Suggested fix: just check if the TSC_INVARIANT
processor bit is set or not. I've attached a patch.
Cheers,
Jan
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