Comment by lll-o-lll

Comment by lll-o-lll a day ago

> Relative latency savings cross-DC become less interesting the longer the distance, so there's nothing wrong with TCP there.

Long fat pipe sees dramatic throughput drops with tcp and relatively small packet loss. Possibly we were holding it wrong; would love to know if there is some definitive guide to doing it right. Good success with UDT.

charleshn 19 hours ago

You might want to look into TCP BBR [0], it might help. Easy to try on Linux, simple sysctl.

[0] https://en.m.wikipedia.org/wiki/TCP_congestion_control#TCP_B...

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buybackoff a day ago

I would not recommend using Aeron on long fat pipes with a chance of packet loss for hight throughput. It was several years since I stress tested this, maybe there have been improvements. I saw some work on that in release notes after. But that was the worst case as recovery was slow.

I would think of UDP with redundant encoding / FEC, to avoid retransmits.

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