On Wed, Jan 27, 2021 at 12:57:07PM +0000, Wookey wrote: > Current arm hardware such as graviton2 (AWS arm64 hardware) has > 'Coherent Mesh Network' interconnect (between components in a > soc). It's important that support for this is built in the kernel so > it can be used. > > This requires CONFIG_ARM_CMN=y
To be precise, this driver is needed for perf event monitoring of this interconnect. The interconnect itself is always in use. On Amazon EC2, these PMU events are only exposed on the bare-metal instances (e.g. m6g.metal), not the VMs. We should still enable support for this driver, in any case. noah
