On Tue, Nov 17, 2020 at 06:45:49PM +0000, Dmitrii Banshchikov wrote:
> The helper uses CLOCK_MONOTONIC_COARSE source of time that is less
> accurate but more performant.
>
> We have a BPF CGROUP_SKB firewall that supports event logging through
> bpf_perf_event_output(). Each event has a timestamp and currently we use
> bpf_ktime_get_ns() for it. Use of bpf_ktime_get_coarse_ns() saves ~15-20
> ns in time required for event logging.
>
> bpf_ktime_get_ns():
> EgressLogByRemoteEndpoint 113.82ns 8.79M
> bpf_ktime_get_coarse_ns():
> EgressLogByRemoteEndpoint 95.40ns 10.48M
Acked-by: Martin KaFai Lau <ka...@fb.com>
