Alan Cox <[email protected]> writes:
> On Llu, 2005-10-03 at 22:07 +0100, Luke Kenneth Casson Leighton wrote:
> > made? _cool_. actual hardware. new knowledge for me. do you know
> > of any online references, papers or stuff? [btw just to clarify:
> > you're saying you have a NUMA bus or you're saying you have an
> > augmented SMP+NUMA+separate-parallel-message-passing-bus er .. thing]
>
> Its a standard current Intel feature. See "mwait" in the processor
> manual. The CPUs are also smart enough to do cache to cache transfers.
> No special hardware no magic.
It's unfortunately useless for anything but kernels right now because
Intel has disabled it in ring 3 (and AMD doesn't support it yet)
And the only good use the kernel found for it so far is fast wakeup
from the idle loop.
> And unless I want my messages to cause interrupts and wake events (in
> which case the APIC does it nicely) then any locked operation on memory
> will do the job just fine. I don't need funky hardware on a system. The
> first point I need funky hardware is between boards and that isn't
> consumer any more.
Firewire + CLFLUSH should do the job.
-Andi
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