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: freebsd-bugs@FreeBSD.org
Reporter: jan.kokemuel...@gmail.com
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
--
You are receiving this mail because:
You are the assignee for the bug.
_______________________________________________
freebsd-bugs@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-bugs
To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
