Hello everyone, We have found a very strange behavior where the transfer is particularly slower when sending data to a socket connecting ports on the same host, but rather faster to the socket connecting ports on different host. /proc/net/sctp/assoc shows that TX_QUEUE of same host socket buffers a lot of data but RX_QUEUE of the socket on the receiving side is almost empty. On the contrary, both TX_QUEUE and RX_QUEUE are almost empty for those sockets connecting different hosts. We first thought this might because the processing difference between local and remote hosts, but the problem remains the same even for a symmetric case where both hosts send same messages to both its own local and remote receiver, and receive messages via different local and remote connections. In our opinion, the data transfer should be faster or at least the same when sending to a socket connecting local ports. This problem particularly occurs when the message size is small, but playing with SCTP NODELAY option doesn't help. I'm not sure if I may have missed anything, but any comments to shed lights on this, or suggestions to tune would be appreciated very much! Regards, Jerry -- 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
