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 <kafai@xxxxxx>
