Re: [PATCH] x86: Voluntary leave_mm before entering ACPI C3

[Arjan van de Ven]

On Wed, 19 Dec 2007 11:48:14 -0800
"H. Peter Anvin" <hpa@xxxxxxxxx> wrote:

> 
> I think C3 guarantees that the cache contents stay intact, and thus
> it might make sense in some technology to preserve the TLB as well
> (being a kind of cache.)

that sounds nice. It's fiction though ;-)

The thing to realize is that linux only sees "ACPI C3"; the BIOS maps that C3 to.. well any of the C states the processor in the system has. What you're saying is afaik correct for the *hardware* C3, not for the "C3" that Linux sees..


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