Hi All,
I am seeing an strange iperf behavior.
i have two servers back to back connected via 10Gbps link.
Now see the results
[root@server1 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 4] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39204
[ 5] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39205
[ 6] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39207
[ 7] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39208
[ 8] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39209
[ 9] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39210
[ 10] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39211
[ 11] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39212
[ 12] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39213
[ 14] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39214
[ 13] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39216
[ 15] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39215
[ 16] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39218
[ 17] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39219
[ 18] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39220
[ 19] local 192.168.30.22 port 5001 connected with 192.168.30.3 port 39221
[ ID] Interval Transfer Bandwidth
[ 14] 0.0-10.0 sec 871 MBytes 729 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 17] 0.0-10.0 sec 942 MBytes 789 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 5] 0.0-10.0 sec 959 MBytes 802 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 18] 0.0-10.0 sec 1004 MBytes 839 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 1020 MBytes 852 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 6] 0.0-10.0 sec 838 MBytes 700 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 16] 0.0-10.0 sec 863 MBytes 721 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 19] 0.0-10.0 sec 836 MBytes 699 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 8] 0.0-10.0 sec 384 MBytes 320 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 11] 0.0-10.0 sec 536 MBytes 447 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 9] 0.0-10.0 sec 469 MBytes 392 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 13] 0.0-10.0 sec 612 MBytes 510 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 15] 0.0-10.0 sec 293 MBytes 244 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 7] 0.0-10.1 sec 490 MBytes 409 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 10] 0.0-10.1 sec 583 MBytes 487 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 12] 0.0-10.1 sec 319 MBytes 266 Mbits/sec
*[SUM] 0.0-10.1 sec 10.8 GBytes 9.19 Gbits/sec*
[root@server2 ~]# iperf -c 192.168.30.22 -P 16
------------------------------------------------------------
Client connecting to 192.168.30.22, TCP port 5001
TCP window size: 64.0 KByte (default)
------------------------------------------------------------
[ 18] local 192.168.30.3 port 39221 connected with 192.168.30.22 port 5001
[ 3] local 192.168.30.3 port 39205 connected with 192.168.30.22 port 5001
[ 4] local 192.168.30.3 port 39204 connected with 192.168.30.22 port 5001
[ 5] local 192.168.30.3 port 39207 connected with 192.168.30.22 port 5001
[ 6] local 192.168.30.3 port 39208 connected with 192.168.30.22 port 5001
[ 7] local 192.168.30.3 port 39209 connected with 192.168.30.22 port 5001
[ 8] local 192.168.30.3 port 39210 connected with 192.168.30.22 port 5001
[ 9] local 192.168.30.3 port 39211 connected with 192.168.30.22 port 5001
[ 11] local 192.168.30.3 port 39212 connected with 192.168.30.22 port 5001
[ 10] local 192.168.30.3 port 39213 connected with 192.168.30.22 port 5001
[ 12] local 192.168.30.3 port 39214 connected with 192.168.30.22 port 5001
[ 14] local 192.168.30.3 port 39216 connected with 192.168.30.22 port 5001
[ 13] local 192.168.30.3 port 39215 connected with 192.168.30.22 port 5001
[ 15] local 192.168.30.3 port 39218 connected with 192.168.30.22 port 5001
[ 16] local 192.168.30.3 port 39219 connected with 192.168.30.22 port 5001
[ 17] local 192.168.30.3 port 39220 connected with 192.168.30.22 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 959 MBytes 804 Mbits/sec
[ 9] 0.0-10.0 sec 583 MBytes 489 Mbits/sec
[ 12] 0.0-10.0 sec 871 MBytes 731 Mbits/sec
[ 16] 0.0-10.0 sec 942 MBytes 790 Mbits/sec
[ 4] 0.0-10.0 sec 1020 MBytes 855 Mbits/sec
[ 5] 0.0-10.0 sec 838 MBytes 702 Mbits/sec
[ 7] 0.0-10.0 sec 384 MBytes 322 Mbits/sec
[ 11] 0.0-10.0 sec 536 MBytes 449 Mbits/sec
[ 13] 0.0-10.0 sec 293 MBytes 246 Mbits/sec
[ 17] 0.0-10.0 sec 1004 MBytes 842 Mbits/sec
[ 18] 0.0-10.0 sec 836 MBytes 701 Mbits/sec
[ 8] 0.0-10.0 sec 469 MBytes 393 Mbits/sec
[ 15] 0.0-10.0 sec 863 MBytes 723 Mbits/sec
[ 6] 0.0-10.0 sec 490 MBytes 410 Mbits/sec
[ 14] 0.0-10.0 sec 612 MBytes 512 Mbits/sec
[ 10] 0.0-10.0 sec 319 MBytes 267 Mbits/sec
*[SUM] 0.0-10.0 sec 10.8 GBytes 9.21 Gbits/sec*
Case II:
[root@server1~]iperf -c 192.168.30.3 -P 16
------------------------------------------------------------
Client connecting to 192.168.30.3, TCP port 5001
TCP window size: 64.0 KByte (default)
------------------------------------------------------------
[ 14] local 192.168.30.22 port 46267 connected with 192.168.30.3 port 5001
[ 3] local 192.168.30.22 port 46255 connected with 192.168.30.3 port 5001
[ 4] local 192.168.30.22 port 46258 connected with 192.168.30.3 port 5001
[ 5] local 192.168.30.22 port 46257 connected with 192.168.30.3 port 5001
[ 7] local 192.168.30.22 port 46259 connected with 192.168.30.3 port 5001
[ 9] local 192.168.30.22 port 46261 connected with 192.168.30.3 port 5001
[ 11] local 192.168.30.22 port 46263 connected with 192.168.30.3 port 5001
[ 8] local 192.168.30.22 port 46260 connected with 192.168.30.3 port 5001
[ 6] local 192.168.30.22 port 46256 connected with 192.168.30.3 port 5001
[ 10] local 192.168.30.22 port 46264 connected with 192.168.30.3 port 5001
[ 12] local 192.168.30.22 port 46265 connected with 192.168.30.3 port 5001
[ 16] local 192.168.30.22 port 46269 connected with 192.168.30.3 port 5001
[ 17] local 192.168.30.22 port 46270 connected with 192.168.30.3 port 5001
[ 18] local 192.168.30.22 port 46271 connected with 192.168.30.3 port 5001
[ 13] local 192.168.30.22 port 46266 connected with 192.168.30.3 port 5001
[ 15] local 192.168.30.22 port 46268 connected with 192.168.30.3 port 5001
[ ID] Interval Transfer Bandwidth
[ 15] 0.0-10.0 sec 547 MBytes 459 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 18] 0.0-10.0 sec 547 MBytes 459 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 16] 0.0-10.0 sec 270 MBytes 226 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 13] 0.0-10.0 sec 547 MBytes 459 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 14] 0.0-10.0 sec 547 MBytes 458 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 8] 0.0-10.0 sec 548 MBytes 459 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 9] 0.0-10.0 sec 457 MBytes 383 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 5] 0.0-10.0 sec 548 MBytes 459 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 12] 0.0-10.0 sec 548 MBytes 459 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 185 MBytes 155 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 277 MBytes 232 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 17] 0.0-10.0 sec 491 MBytes 411 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 10] 0.0-10.0 sec 173 MBytes 145 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 6] 0.0-10.0 sec 91.9 MBytes 76.8 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 11] 0.0-10.0 sec 58.4 MBytes 48.7 Mbits/sec
[ ID] Interval Transfer Bandwidth
[ 7] 0.0-10.1 sec 197 MBytes 164 Mbits/sec
*[SUM] 0.0-10.1 sec 5.89 GBytes 5.02 Gbits/sec*
[root@server2 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 4] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46256
[ 5] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46257
[ 6] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46258
[ 7] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46255
[ 8] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46259
[ 9] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46261
[ 10] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46260
[ 11] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46264
[ 12] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46269
[ 13] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46270
[ 14] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46271
[ 15] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46263
[ 16] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46265
[ 17] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46267
[ 18] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46266
[ 19] local 192.168.30.3 port 5001 connected with 192.168.30.22 port 46268
[ ID] Interval Transfer Bandwidth
[ 6] 0.0-11.0 sec 277 MBytes 210 Mbits/sec
[ 12] 0.0-11.0 sec 270 MBytes 205 Mbits/sec
[ 19] 0.0-11.0 sec 547 MBytes 415 Mbits/sec
[ 10] 0.0-11.1 sec 548 MBytes 415 Mbits/sec
[ 14] 0.0-11.0 sec 547 MBytes 415 Mbits/sec
[ 17] 0.0-11.1 sec 547 MBytes 415 Mbits/sec
[ 18] 0.0-11.1 sec 547 MBytes 415 Mbits/sec
[ 5] 0.0-11.1 sec 548 MBytes 416 Mbits/sec
[ 9] 0.0-11.1 sec 457 MBytes 347 Mbits/sec
[ 13] 0.0-11.1 sec 491 MBytes 372 Mbits/sec
[ 16] 0.0-11.1 sec 548 MBytes 415 Mbits/sec
[ 4] 0.0-11.1 sec 91.9 MBytes 69.7 Mbits/sec
[ 15] 0.0-11.1 sec 58.4 MBytes 44.2 Mbits/sec
[ 7] 0.0-11.1 sec 185 MBytes 140 Mbits/sec
[ 8] 0.0-11.1 sec 197 MBytes 149 Mbits/sec
[ 11] 0.0-11.1 sec 173 MBytes 131 Mbits/sec
*[SUM] 0.0-11.1 sec 5.89 GBytes 4.57 Gbits/sec*
If i am running iperf-client on server 2 and iperf-server on my server 1 i
am getting an speed of *9.21 Gbits/sec BUT *in
*CASE II *running iperf-server on server 2 and iperf-client on server 1 i
am only getting *4.57 Gbits/sec.*
*Whats the reason how to resolve it.*
*I am using centos6.4*
*Thanks*
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