Re: [RFC PATCH 0/7] Optimization to reduce the cost of newidle balance
From: Matt Fleming
Date: Tue Jul 16 2024 - 10:17:01 EST
> Hi,
>
> This is the second version of the newidle balance optimization[1].
> It aims to reduce the cost of newidle balance which is found to
> occupy noticeable CPU cycles on some high-core count systems.
Hi there, what's the status of this series?
I'm seeing this same symptom of burning cycles in update_sd_lb_stats() on an
AMD EPYC 7713 machine (128 CPUs, 8 NUMA nodes). The machine is about 50% idle
and upadte_sd_lb_stats() sits as the first entry in perf top with about 3.62%
of CPU cycles.
Thanks,
Matt