The config page at torservers.net advises increasing the TX Queue Length from
the default 1,000 to 20,000. For a differing opinion see the assertion that
this increases latencies and hampers network congestion recovery
("bufferbloat"):
http://www.cyberciti.biz/faq/gentoo-centos-rhel-debian-fedora-increasing-txqueuelen/
I'm running an exit node on a 100Mbps network (multi-core CPU on RHEL5), and
typically have 600 - 800 connections at any given time. TorStatus usually
reports my throughput at 700KB to 800KB per second.
I suspect that the 20,000 recommendation pertains to Gbit Ethernet. Still,
though, is the default of 1,000 adequate for my Tor traffic?
More generally, I haven't tweaked my networking (system network buffer sizes,
etc.) because it is unclear to me what recommendations are appropriate for exit
nodes running contemporary versions (v0.2.2.30+) of Tor. Reliable benchmarking
can't be done because the system load varies with traffic at any given time.
Is there a way to prove empirically that this or that adjustment to the system
configuration really has an effect on the performance of a Tor relay node?
Thanks.
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