On Thu, Mar 08, 2012 at 05:29:47PM -0500, Phillip Susi wrote:
> You also need to remember that 3.4x the clock speed does not mean you
> actually end up finishing your work 3.4x faster. Intel recommends
> using the ondemand governor, so if you are claiming they are wrong,
> and you save more po
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On 03/08/2012 12:11 PM, Matthew Garrett wrote:
> My i7 draws about 7W when fully loaded at 800MHz, and about 27W when
> fully loaded at 2.7GHz. That's a 3.4x performance improvement at a
> 3.9x power increase. So, naively, that does result in a fixed
On Thu, Mar 08, 2012 at 11:22:04AM -0500, Phillip Susi wrote:
> On 3/8/2012 11:10 AM, Matthew Garrett wrote:
> >Yes, if those are the actual power figures. But they're typically not
> >going to be.
>
> Can you be a little less vague and hand wavy?
My i7 draws about 7W when fully loaded at 800MHz,
On 3/8/2012 11:10 AM, Matthew Garrett wrote:
Yes, if those are the actual power figures. But they're typically not
going to be.
Can you be a little less vague and hand wavy?
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On Thu, Mar 08, 2012 at 11:03:42AM -0500, Phillip Susi wrote:
> On 3/8/2012 9:47 AM, Matthew Garrett wrote:
> >This is (broadly speaking) untrue. There's a bunch of fixed costs that a
> >naive P=IV² doesn't take into account. Assuming a fixed amount of work,
> >race to idle is almost always the mos
On 3/8/2012 9:47 AM, Matthew Garrett wrote:
This is (broadly speaking) untrue. There's a bunch of fixed costs that a
naive P=IV² doesn't take into account. Assuming a fixed amount of work,
race to idle is almost always the most power efficient strategy.
What fixed costs? If you spend 5 seconds
On Mon, Mar 05, 2012 at 09:39:34PM -0500, Phillip Susi wrote:
> With correct frequency management, the lower power per instruction of
> the lower frequencies outweighs the reduced time in the lower C
> states.
This is (broadly speaking) untrue. There's a bunch of fixed costs that a
naive P=IV²
