Mailinglist Archive: opensuse-bugs (5385 mails)

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https://bugzilla.novell.com/show_bug.cgi?id=623680

https://bugzilla.novell.com/show_bug.cgi?id=623680#c57


--- Comment #57 from Martin Wilck <martin.wilck@xxxxxxxxxxxxxx> 2011-04-12 
20:15:48 UTC ---
(In reply to comment #50)
> The reason for this lies in how Xen manages time, which is completely 
> different
> from Linux. Making C2/C3 usable under Xen on this systems of yours is 
> certainly
> theoretically doable, but I see no point in spending time here - you'll have 
> to
> acknowledge your system is not the youngest anymore ;-) .

Hm, the whole point of this bug report (for me) was to enable C2/C3 on this
machine :-(

If I am reading the code correctly, the main difference between Xen and Linux
is that Linux completely avoids using the TSC where it is unstable or otherwise
unreliable. Xen, OTOH, always uses TSC, and just uses the "platform timer" to
calibrate and adjust TSC when it isn't stable.

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