Hi Tony,

Great example.

And how would that be mapped to the concept of power groups ?

How do you associate cores of the CPU to network topology ? Likewise for
ASICs ... is it always hardwired with physical interfaces ? That would be
highly inefficient.

Thx,
R.



On Wed, Jul 22, 2026 at 12:23 PM Tony Li <[email protected]> wrote:

>
> Hi Robert,
>
> The ARM Cortex-A53 is an example of a multi-core CPU that supports clock
> gating on its cores.
>
> It's technical reference manual:
> https://community.arm.com/cfs-file/__key/communityserver-discussions-components-files/80/DDI0515A3b_5F00_juno_5F00_arm_5F00_development_5F00_platform_5F00_soc_5F00_trm.pdf
>
> Other modern ASICs use similar schemes.
>
> Tony
>
>
> On Wed, Jul 22, 2026 at 12:12 PM Robert Raszuk - robert at raszuk.net <
> [email protected]> wrote:
>
>> Hi Rob,
>>
>> Could you provide some real examples of those "modern ASICs" where you
>> can turn on/off parts of it ?
>>
>> Any pointers to APIs you could share would also be nice.
>>
>> Thx,
>> R.
>>
>>
>> On Wed, Jul 22, 2026 at 10:31 AM Rob Evans <[email protected]>
>> wrote:
>>
>>> >  Also the simplicity of the pizza box the electronics is minimal and
>>> the main power draw is just the ASIC.  As mentioned my Robert all you can
>>> do is turn off SFP laser.
>>>
>>> I'm not in Vienna, so this may be out of context. However, as a
>>> standalone statement that isn't true for many modern ASICs, where you
>>> can power off parts of the ASIC that aren't being used.
>>>
>>> Cheers,
>>> Rob
>>>
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