Sorry, this should be going onto the list!
Could it be some kind of fault in the NIC?
What happens if you set up a loopback test on each machine?
E.g. set up another IP on each machine and use it as the client/server, so that
all traffic is technically staying on the server. I’m not sure if this would be
“optimized out” into simple loopback traffic, though.
--
Colin Dean
c...@cad.cx
On Monday, November 25, 2013 at 10:41 AM, Robert Clove wrote:
> Hi Colin,
>
> Thanks for the reply.
> The two servers are exactly of same configuration (hardware and all).
> The iptables,ip6tables,firewall are all off.
> When i run the iperf no other software runs infact the servers are all new
> and they don't have anything other than iperf in them.
>
> Thanks
> Clove
>
>
>
> On Mon, Nov 25, 2013 at 8:59 PM, Colin Dean <c...@cad.cx
> (mailto:c...@cad.cx)> wrote:
> > If I’m analyzing this correctly, I see two servers:
> >
> > 192.168.30.22
> > 192.168.30.3
> >
> > Tests with .22 as iperf server yield expected results, but tests with .3 as
> > the server yield half the expected result.
> >
> > * Is there any kind of bandwidth monitoring software that could be
> > interfering?
> > * Any firewall or packet filtering protecting the .3 IP?
> > * Is the .3 NIC in the correct duplexing mode?
> > * Are the two servers of equivalent hardware? Is the .3 server actually
> > capable of generating ~10 Gbps worth of traffic, not just receiving it?
> >
> >
> > --
> > Colin Dean
> > c...@cad.cx (mailto:c...@cad.cx)
> >
> >
> > On Monday, November 25, 2013 at 5:16 AM, Robert Clove wrote:
> >
> >
> >
> > > 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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> > >
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> >
> >
>
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