Hi all, I found a strange SCTP stream behavior, when the message size equal to the recv buffer size, the performance is VERY LOW ( just 1% !!!). TCP no such issue, just drop 20%. *) SCTP message size = 128K, recvbuffer size = 128K netperf -H 10.0.0.201 -p 1234 -l 10 -t SCTP_STREAM -- -m 128K -S 64K SCTP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.0.0.201 () port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 131072 212992 131072 10.04 6.16 *) message size = 64K, recvbuffer size = 128K Then I double the send buffer size: netperf -H 10.0.0.201 -p 1234 -l 10 -t SCTP_STREAM -- -m 64K -S 64K SCTP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.0.0.201 () port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 131072 212992 65536 10.00 596.26 But TCP no such issue, *) TCP message size = 128K, recvbuffer size = 128K netperf -H 10.0.0.201 -p 1234 -l 10 -t TCP_STREAM -- -m 128K -S 64K MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.0.0.201 () port 0 AF_INET ./netperf -H 10.0.0.201 -p 1234 -l 10 -t TCP_STREAM -- -m 128K -S 64K Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 131072 16384 131072 10.00 2368.84 *) TCP message size = 64K, recvbuffer size = 128K netperf -H 10.0.0.201 -p 1234 -l 10 -t TCP_STREAM -- -m 128K -S 128K MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.0.0.201 () port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 262144 16384 131072 10.00 2993.15 I'm doing these test 2 VMware VMs with Intel Core i3-2120 @ 3.30GHz, running Ubuntu 14.04 LTS, Linux kernel3.13.0-24-generic. SCTP_RR is very good, but SCTP_STREAM have many improve room: [9250.98] netperf -H 10.0.0.201 -p 1234 -l 10 -t UDP_RR -- -r 960,512 [9070.85] netperf -H 10.0.0.201 -p 1234 -l 10 -t TCP_RR -- -r 960,512 [2127.47] netperf -H 10.0.0.201 -p 1234 -l 10 -t TCP_CRR -- -r 960,512 [8126.60] netperf -H 10.0.0.201 -p 1234 -l 10 -t SCTP_RR -- -r 960,512 [3380.84] netperf -H 10.0.0.201 -p 1234 -l 10 -t TCP_STREAM -- -m 16384 [ 952.17] netperf -H 10.0.0.201 -p 1234 -l 10 -t UDP_STREAM -- -m 65504 [ 699.98] netperf -H 10.0.0.201 -p 1234 -l 10 -t SCTP_STREAM -- -m 128K -s 512K -M 128K -S 256K Regards, Dongsheng -- 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
