From: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx> Date: Fri, 23 Dec 2016 14:29:37 -0200 > Currently if SCTP closes the receive window with window pressure, mostly > caused by excessive skb overhead on payload/overheads ratio, SCTP will > close the window abruptly while saving the delta on rwnd_press. It will > start recovering rwnd as the chunks are consumed by the application and > the rwnd_press will be only recovered after rwnd reach the same value as > of rwnd_press, mostly to prevent silly window syndrome. > > Thing is, this is very inefficient with small data chunks, as with those > it will never reach back that value, and thus it will never recover from > such pressure. This means that we will not issue window updates when > recovering from 0 window and will rely on a sender retransmit to notice > it. > > The fix here is to remove such threshold, as no value is good enough: it > depends on the (avg) chunk sizes being used. > > Test with netperf -t SCTP_STREAM -- -m 1, and trigger 0 window by > sending SIGSTOP to netserver, sleep 1.2, and SIGCONT. > Rate limited to 845kbps, for visibility. Capture done at netserver side. ... > Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx> Applied. -- To unsubscribe from this list: send the line "unsubscribe linux-sctp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
