nanog mailing list archives
Re: Latency, TCP ACKs and upload needs
From: Eygene Ryabinkin <rea+nanog () grid kiae ru>
Date: Fri, 22 Apr 2016 09:17:54 +0300
Wed, Apr 20, 2016 at 07:27:53AM -0700, Leo Bicknell wrote:
90%+ of the stacks deployed will be too small. Modern Unix generally has "autotuning" TCP stacks, but I don't think Windows or OS X has those features yet
OS X since ~10.5 has autotuning, here are some hints from ESnet https://fasterdata.es.net/host-tuning/osx/ Personally never tried this on the sat-type RTT. As explained, scaling factor of 3 is a limiting one for high-performance transfers. For sat links may limit the things too, since 64K * 2^3 / 0.9 ms RTT * 8 ~ 4.5 Mbit/sec, but one's mileage may vary. And, of course, packet loss can turn down this BDP-derived speed drastically. -- Eygene Ryabinkin, National Research Centre "Kurchatov Institute" Always code as if the guy who ends up maintaining your code will be a violent psychopath who knows where you live.
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Current thread:
- Latency, TCP ACKs and upload needs Jean-Francois Mezei (Apr 19)
- Re: Latency, TCP ACKs and upload needs Jared Mauch (Apr 19)
- Re: Latency, TCP ACKs and upload needs Eric Kuhnke (Apr 19)
- Re: Latency, TCP ACKs and upload needs joel jaeggli (Apr 19)
- Re: Latency, TCP ACKs and upload needs Eric Kuhnke (Apr 19)
- Re: Latency, TCP ACKs and upload needs Leo Bicknell (Apr 20)
- Re: Latency, TCP ACKs and upload needs Jean-Francois Mezei (Apr 20)
- Re: Latency, TCP ACKs and upload needs Lee (Apr 20)
- Re: Latency, TCP ACKs and upload needs Tony Finch (Apr 20)
- Re: Latency, TCP ACKs and upload needs Eygene Ryabinkin (Apr 21)
- Re: Latency, TCP ACKs and upload needs Chris Welti (Apr 24)
- Re: Latency, TCP ACKs and upload needs Lee (Apr 20)
- Re: Latency, TCP ACKs and upload needs Mikael Abrahamsson (Apr 20)