On Wed, 2012-05-16 at 12:59 +0300, Jonathan Morton wrote: > That's a pretty specific type of blackhole - one that can pass enough > ECN information to permit negotiation of an ECN flow, but which then > squashes Congestion Experienced codepoints. How common are those? >
Very common since TCP ECN negociation doesnt use ECN on IP header. (SYN, SYNACK, and ACK messages dont use ECT) So a network playing games with TOS field can be a ECN blackhole, still allowing TCP to negociate ECN enabled sessions. > If fq_codel drops from the head of the longest flow when the queue is > physically full, rather than the next one to be serviced, all should > be well even in that case. Not really. Unless you afford 3 second delay in queue. _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
