Re: Dual Core on Linux questions

[Wes Felter]

Alejandro Bonilla wrote:
> Hi,
>
> I have a few questions about the PM Dual Core and how could it really work
> with Linux. Sorry if there are new patches on LKML about any of these things:
>
> Could each processor or die, have it's own cpufreq scaling governor?
>
> Is there a way to allow one die to be idle and let the other one normal?
>
> So in other words, could we manage these processors speedstep, utilization and
> workload individually?

This depends on your hardware. I was reading the Sossaman data sheet the 
other day, and it says that the entire chip must run at the same 
frequency. You can set each core to a different frequency, but the 
hardware chooses the higher of the two. Likewise, the entire chip can 
sleep, but individual cores can only go into C1. I imagine the Core Duo 
is the same.

IIRC, the dual-core Opterons behave a little differently but the two 
cores still have to run at the same frequency.

Wes Felter - wesley@xxxxxxxxxx

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/