But in loop back case i am getting approx 70 Gbps rate.
How to test in loop back?
On Monday, November 25, 2013, Colin Dean wrote:
> 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 <javascript:_e({}, 'cvml', '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> 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
>
> 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 M
>
>
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