By: David Hess (davidwhess.delete@this.gmail.com), September 13, 2021 12:32 pm
Room: Moderated Discussions
Doug S (foo.delete@this.bar.bar) on September 13, 2021 11:57 am wrote:
>
> I'm a little confused on this point. Why would you want to alter voltage while keeping frequency
> constant? Shouldn't you always want to run at the lowest voltage capable of handling a given frequency
> to minimize power? In what circumstance would you for example want to increase voltage while keeping
> frequency constant? That makes no sense to me, but maybe I'm missing something.
The voltage has to be increased, and settle at the new value, before the frequency is increased. And in reverse, the frequency has to be decreased before the voltage is lowered.
With some exceptions which do not apply here, the processor does not "stop" while the voltage is being changed.
>
> I'm a little confused on this point. Why would you want to alter voltage while keeping frequency
> constant? Shouldn't you always want to run at the lowest voltage capable of handling a given frequency
> to minimize power? In what circumstance would you for example want to increase voltage while keeping
> frequency constant? That makes no sense to me, but maybe I'm missing something.
The voltage has to be increased, and settle at the new value, before the frequency is increased. And in reverse, the frequency has to be decreased before the voltage is lowered.
With some exceptions which do not apply here, the processor does not "stop" while the voltage is being changed.
| Topic | Posted By | Date |
|---|---|---|
| alder lake. | inteluser | 2021/09/10 02:52 AM |
| alder lake. | Andrei F | 2021/09/10 10:31 AM |
| alder lake. | Andrey | 2021/09/10 10:38 AM |
| alder lake. | rwessel | 2021/09/10 12:18 PM |
| alder lake. | Andrei F | 2021/09/10 01:49 PM |
| alder lake. | Andrey | 2021/09/10 05:12 PM |
| alder lake. | David Hess | 2021/09/10 08:39 PM |
| alder lake. | Andrey | 2021/09/11 01:28 AM |
| alder lake. | --- | 2021/09/10 06:24 PM |
| alder lake. | Andrei F | 2021/09/12 02:09 AM |
| DVFS | David Kanter | 2021/09/12 10:58 PM |
| DVFS | Andrei F | 2021/09/13 02:02 AM |
| DVFS | Anon | 2021/09/13 04:28 AM |
| DVFS | Jukka Larja | 2021/09/13 06:35 AM |
| DVFS | Andrei F | 2021/09/14 01:07 AM |
| DVFS | Jukka Larja | 2021/09/14 05:11 AM |
| DVFS | Andrei F | 2021/09/14 08:55 AM |
| DVFS | Jukka Larja | 2021/09/14 11:23 AM |
| DVFS | --- | 2021/09/13 11:19 AM |
| DVFS | Doug S | 2021/09/13 11:57 AM |
| DVFS | David Hess | 2021/09/13 12:32 PM |
| DVFS | --- | 2021/09/13 02:06 PM |
| DVFS | David Hess | 2021/09/13 03:21 PM |
| DVFS | David Kanter | 2021/09/15 04:05 PM |
| DVFS | David Hess | 2021/09/13 12:46 PM |
| DVFS | Jukka Larja | 2021/09/14 05:35 AM |
| Quick shutdown? | David Kanter | 2021/09/15 11:46 AM |
| Quick shutdown? | Andrei F | 2021/09/16 08:12 AM |
| Quick shutdown? | David Kanter | 2021/09/16 12:04 PM |
| Quick shutdown? | Andrei F | 2021/09/17 02:35 AM |
| Quick shutdown? | Andrei F | 2021/09/17 02:38 AM |
| and weren't 'they' right? | Daniel B | 2021/09/13 05:20 AM |
| and weren't 'they' right? | Andrei F | 2021/09/13 05:51 AM |
| and weren't 'they' right? | Daniel B | 2021/09/13 07:29 AM |
| and weren't 'they' right? | anon | 2021/09/13 06:07 AM |
| and weren't 'they' right? | Jukka Larja | 2021/09/13 06:26 AM |
| and weren't 'they' right? | anon | 2021/09/14 12:37 AM |
| Alder Lake has no little cores | Heikki Kultala | 2021/09/13 07:33 AM |
| Alder Lake has no little cores | Michael S | 2021/09/13 08:33 AM |
| Alder Lake has no little cores | me | 2021/09/13 11:45 AM |
| Alder Lake has no little cores | Heikki Kultala | 2021/09/13 02:49 PM |
| Alder Lake has no little cores | anon | 2021/09/14 12:42 AM |
| why stop at two core sizes? | hobold | 2021/09/14 06:47 AM |
| Memory caches did this, right? | Mark Roulo | 2021/09/14 03:51 PM |
| Memory caches did this, right? | Brett | 2021/09/14 08:17 PM |
| Memory caches did this, right? | Kevin G | 2021/09/16 04:10 PM |
| Large reorder buffers (L1+L2) | ⚛ | 2021/09/15 12:24 PM |
| Large reorder buffers (L1+L2) | hobold | 2021/09/15 01:06 PM |
| Alder Lake has no little cores | Adrian | 2021/09/14 09:33 AM |
| and weren't 'they' right? | David Hess | 2021/09/13 01:00 PM |
| Battery vs Performance | Mark Roulo | 2021/09/13 01:18 PM |
| Battery vs Performance | Doug S | 2021/09/13 03:05 PM |
| Battery vs Performance | David Hess | 2021/09/13 03:28 PM |
| Battery vs Performance | --- | 2021/09/13 06:08 PM |
| Battery vs Performance | --- | 2021/09/13 06:08 PM |
| Battery vs Performance | Doug S | 2021/09/13 09:53 PM |
| Battery vs Performance | Anon | 2021/09/14 07:42 AM |
| and weren't 'they' right? | Daniel B | 2021/09/13 01:57 PM |
| and weren't 'they' right? | David Hess | 2021/09/13 03:11 PM |
| and weren't 'they' right? | --- | 2021/09/13 03:38 PM |
| and weren't 'they' right? | --- | 2021/09/13 03:32 PM |
| and weren't 'they' right? | Brendan | 2021/09/14 04:30 AM |
| and weren't 'they' right? | Jukka Larja | 2021/09/14 05:31 AM |
| and weren't 'they' right? | Etienne Lorrain | 2021/09/14 01:29 AM |
