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Does C-state tuning even do anything on EC2? My intuition says it probably doesn't pass through to the underlying hardware -- once the VM exits, it's up to the
by duskwuff 5y ago
Does C-state tuning even do anything on EC2? My intuition says it probably doesn't pass through to the underlying hardware -- once the VM exits, it's up to the host OS what power state the CPU goes into.
- jeffbee 5y agoIt definitely works and you can measure the effect. There's official documentation on what it does and how to tune it: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/processor_state_control.html https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/processo...
- duskwuff 5y agoOkay, so it looks as though it only applies to certain large instance types -- presumably ones which are large enough that it makes sense for the host to statically allocate CPU cores (or even sockets) to a guest. Interesting.