On 05/14/2012 11:03 AM, Eric Dumazet wrote:
On Mon, 2012-05-14 at 19:50 +0200, Juliusz Chroboczek wrote:
[Pro memoria, I'm the author of a few of the networking bits in
Transmission, notably the DHT, the µTP support and large parts of the
IPv6 code.]
0) No ecn on transmission, at least.
TCP flows will use ECN if your system is configured to use ECN. µTP
doesn't do ECN, and there's no easy way to implement it -- there's no
API to set ECN on UDP packets.
There is an API to set ECN on UDP packets.
setsockopt() IP_TOS, with val = 2
I think, but am not certain, jch is referring to the problem of
negotiating ecn over uTP.
I'd like it if it could, as a background protocol it could then give us
some statistics as to the actual success rate of passing it, and if it
fails to work right, fall back into a more 'happy eyeballs' scenario.
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