[Tor-BSD] Tor BSD underperformance (was Recognizing Randomness Exhaustion)

Greg Troxel gdt at lexort.com
Sat Jan 3 19:57:43 EST 2015

teor <teor2345 at gmail.com> writes:

> Tor (just in the process of being released) has some
> changes to queuing behaviour using the KIST algorithm.
> The KIST algorithm keeps the queues inside tor, and makes
> prioritisation decisions from there, rather than writing as much as
> possible to the OS TCP queues. I'm not sure how functional it is on
> *BSDs, but Nick Mathewson should be able to comment on that. (I've
> cc'd tor-dev and Nick.)

From skimming the KIST paper (I will read in detail when I find time),
it seems they are claiming increase in throughput of around 10%, with
the main benefit being lower latency.  So while that sounds great, it
doesn't seem like lack of KIST is the reason for the apparent 3x
slowdown observed in OpenBSD.

Does anyone have experience to report on any platform other than Linux
or OSX?

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