dbea038e96
Why I did it Networking devices need to be responsive. Such responsiveness is harmed when the CPU change state. There is a latency penalty when a CPU is idle (e.g C2) and need to exit this state to come back to C1 state. To prevent this from happening the CPU should be forced to remain in C1 state. How I did it Generalize the cstate forcing to C1 to all Arista products. This is done by adding processor.max_cstate=1 to the kernel cmdline for all CPUs. Additionally Intel CPUs also need intel_idle.max_cstate=0 to fallback to the acpi_idle driver. How to verify it Check that processor.max_cstate=1 is present on the cmdline for AMD CPUs Check that both processor.max_cstate=1 and intel_idle.max_cstate=0 are present on the cmdline for Intel CPUs |
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