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Thanks Dan for reposting :) If you want more of this stuff, follow my twitter: https://twitter.com/majek04/status/1687023191506530304 https://twitter.com/majek

by majke 3y ago

Thanks Dan for reposting :) If you want more of this stuff, follow my twitter: https://twitter.com/majek04/status/1687023191506530304 https://twitter.com/majek04/status/1687023191506530304 Lately it seems I'm spending way too much time on ping. This is from last month: https://blog.cloudflare.com/the-day-my-ping-took-countermeasures/ https://blog.cloudflare.com/the-day-my-ping-took-countermeas...

mananaysiempre 3y ago
Wait, can Linux not timestamp packets with the monotonic clock? Using wall time just feels wrong here.
- majke 3y ago
  Yup! The details of Linux networking API are often surprising. I think if it's possible to change the ping algo to reduce the potential for wall clock change affecting the measurement. For example, instead of using SO_TIMESTAMP to measure wall clock diffed with the send time, maybe it's possible to grab the wall clock just before recv() and use wall clock to measure the event-loop time only (which is way shorter than the ping rtt).