Re: Lightweight packet timestamping

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On 6/4/20 7:30 AM, Federico Parola wrote:
> Hello everybody,
> I'm implementing a token bucket algorithm to apply rate limit to traffic and I need the timestamp of packets to update the bucket. To get this information I'm using the bpf_ktime_get_ns() helper but I've discovered it has a non negligible impact on performance. I've seen there is work in progress to make hardware timestamps available to XDP programs, but I don't know if this feature is already available. Is there a faster way to retrieve this information?
> Thanks for your attention.

bpf_ktime_get_ns should be fairly light. What kind of performance loss
are you seeing with it?

XDP does not support access to h/w timestamps at the moment.

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