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How to use LEDBAT?
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How to use LEDBAT?

  • Subject: How to use LEDBAT?
  • From: Jens Alfke <email@hidden>
  • Date: Sun, 25 Jan 2015 15:25:38 -0800
I'm curious about using LEDBAT* for large network transfers, to avoid degrading performance of other TCP connections on the device and/or on the entire LAN. It's prominently mentioned that Apple uses LEDBAT for software updates (source code** is in the kernel open-source repo) but I can't find any documentation of how to actually enable it on a socket. Is there an ioctl call to do this? Or is this something that's Apple-internal and not available to 3rd party apps?

—Jens

* https://en.wikipedia.org/wiki/LEDBAT
** http://www.opensource.apple.com/source/xnu/xnu-1699.32.7/bsd/netinet/tcp_ledbat.c
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