Arjan van de Ven wrote:
On Wed, 19 Dec 2007 11:48:14 -0800
"H. Peter Anvin" <[email protected]> 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..
Well, it can only map ACPI C3 to a state which is no more "dead" than
what would normally be permitted by C3. IIRC, C3 is allowed to require
that DMA be turned off (unlike C2), but is not allowed to lose the CPU
state.
-hpa
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