Is there a Secure Exclave Processor in M4 chips, a sister to the Secure Enclaves in Macs with T1, T2 or Apple silicon chips? What are they, and what do they do?
M4
How macOS can not only regulate CPU cluster frequencies to control power use, but also moves threads to E cores. This reduces power use of over 50 W to less than 13 W.
Low Power mode operates pre-emptive control of CPU core frequency to deliver the best compromise between low power use and performance. Here’s how it does so.
How Apple silicon CPUs control core frequencies and power use when running in Low Power mode. Includes M4 Pro and M3 Pro data, and estimates of energy requirements.
Apple refers to Energy Modes and Power Modes, and despite older MacBook Pro models offering Low Power mode, tells us that isn’t what Low Power mode is now. Here are the observations and explanations.
Sequoia boot volume layout, M4 CPU core management, SIP and csrutil, backup storage, Graphing Calculator and more.
From the start of the fourth cycle in M4 Macs and the smallest ever, through the omission in macOS VMs, and QuickLook shortcomings, to the stealth firmware update.
A first attempt to describe how macOS decides for a thread which type of core, which cluster, which core, what frequency, and how mobile it should be.
TB5 promises twice the data transfer rate of TB3, and three times that when supporting external displays. How close is it to achieving those?
How macOS controls CPU P core cluster frequency according to the cluster total active residency, in synthetic in-core tests, compression and when running virtual machines.
The Eclectic Light Company 