Greetings;
Fixing the MTU at the host is only one part of the problem, recall that
for MTU to work correctly, all things in the broadcast domain need to be
configured in the same manner.
It does not appear that the MTU settings for something in the network
path are correct. Using ping between one of the ESnet hosts and your
hosts we can determine the settings that work, and those that don't.
E.g. this is the last size that works:
[rootjz@bost-pt1 ~]# ping -s 1464 -M do -c 4
14.139.5.202
PING 14.139.5.202 (14.139.5.202) 1464(1492) bytes of data.
1472 bytes from 14.139.5.202: icmp_seq=1 ttl=45 time=285 ms
1472 bytes from 14.139.5.202: icmp_seq=2 ttl=45 time=285 ms
1472 bytes from 14.139.5.202: icmp_seq=3 ttl=45 time=285 ms
1472 bytes from 14.139.5.202: icmp_seq=4 ttl=45 time=285 ms
--- 14.139.5.202 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3285ms
rtt min/avg/max/mdev = 285.530/285.588/285.675/0.537 ms
And this is the first size (and larger) that doesn't:
[rootjz@bost-pt1 ~]# ping -s 1465 -M do -c 4
14.139.5.202
PING 14.139.5.202 (14.139.5.202) 1465(1493) bytes of data.
ping: local error: Message too long, mtu=1492
ping: local error: Message too long, mtu=1492
ping: local error: Message too long, mtu=1492
ping: local error: Message too long, mtu=1492
--- 14.139.5.202 ping statistics ---
4 packets transmitted, 0 received, +4 errors, 100% packet loss, time
4001ms
Something in the network path is only allowing MTU of 1492, therefore
BWCTL (and probably a lot of other things) won't work. Once this is
fixed on the network, things will work again.
Thanks;
-jason
Om Prakash Singh wrote:
Hi,
The MTU is 9000 but I try with MTU 1500 also but same output
show. can you help
Thanks On 05/16/16 05:11 PM, Szymon
Trocha wrote:
W dniu 16.05.2016 o 10:52, om
prakash
singh pisze:
Hi ,
After updating perfsonar toolkit ver from 3.4 to 3.5.1, when i test with bwctl
then i am not getting proper bandwidth output . can you help me
bwctl -c sacr-pt1.es.net
[ 15] local 14.139.5.202 port 44195 connected to 198.129.254.38 port 5445
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 15] 0.00-1.00 sec 87.4 KBytes 0.72 Mbits/sec 0 87.4 KBytes
[ 15] 1.00-2.00 sec 0.00 Bytes 0.00 Mbits/sec 1 26.2 KBytes
[ 15] 2.00-3.00 sec 0.00 Bytes 0.00 Mbits/sec 1 26.2 KBytes
[ 15] 3.00-4.00 sec 0.00 Bytes 0.00 Mbits/sec 0 26.2 KBytes
[ 15] 4.00-5.00 sec 0.00 Bytes 0.00 Mbits/sec 0 26.2 KBytes
[ 15] 5.00-6.00 sec 0.00 Bytes 0.00 Mbits/sec 1 26.2 KBytes
[ 15] 6.00-7.00 sec 0.00 Bytes 0.00 Mbits/sec 0 26.2 KBytes
[ 15] 7.00-8.00 sec 0.00 Bytes 0.00 Mbits/sec 0 26.2 KBytes
[ 15] 8.00-9.00 sec 0.00 Bytes 0.00 Mbits/sec 0 26.2 KBytes
[ 15] 9.00-10.00 sec 0.00 Bytes 0.00 Mbits/sec 0 26.2 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 15] 0.00-10.00 sec 87.4 KBytes 0.07 Mbits/sec 3 sender
[ 15] 0.00-10.00 sec 0.00 Bytes 0.00 Mbits/sec receiver
2nd host
bwctl -c bost-pt1.es.net
bwctl: Using tool: iperf3
SENDER START
Connecting to host 198.124.238.66, port 5403
[ 15] local 14.139.5.218 port 34035 connected to 198.124.238.66 port 5403
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 15] 0.00-1.00 sec 87.4 KBytes 0.72 Mbits/sec 0 87.4 KBytes
[ 15] 1.00-2.00 sec 0.00 Bytes 0.00 Mbits/sec 1 26.2 KBytes
[ 15] 2.00-3.00 sec 0.00 Bytes 0.00 Mbits/sec 1 26.2 KBytes
[ 15] 3.00-4.00 sec 0.00 Bytes 0.00 Mbits/sec 0 26.2 KBytes
[ 15] 4.00-5.00 sec 0.00 Bytes 0.00 Mbits/sec 0 26.2 KBytes
[ 15] 5.00-6.00 sec 0.00 Bytes 0.00 Mbits/sec 1 26.2 KBytes
[ 15] 6.00-7.00 sec 0.00 Bytes 0.00 Mbits/sec 0 26.2 KBytes
[ 15] 7.00-8.00 sec 0.00 Bytes 0.00 Mbits/sec 0 26.2 KBytes
[ 15] 8.00-9.00 sec 0.00 Bytes 0.00 Mbits/sec 0 26.2 KBytes
[ 15] 9.00-10.00 sec 0.00 Bytes 0.00 Mbits/sec 0 26.2 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 15] 0.00-10.00 sec 87.4 KBytes 0.07 Mbits/sec 3 sender
[ 15] 0.00-10.00 sec 0.00 Bytes 0.00 Mbits/sec receiver
but its oppsite its working meand it gives reverse throughput
bwctl: Using tool: iperf3
SENDER START
Connecting to host 14.139.5.202, port 5549
[ 14] local 198.129.254.38 port 60947 connected to 14.139.5.202 port 5549
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 14] 0.00-1.00 sec 127 KBytes 1.04 Mbits/sec 24 5.62 KBytes
[ 14] 1.00-2.00 sec 61.9 KBytes 0.51 Mbits/sec 0 15.5 KBytes
[ 14] 2.00-3.00 sec 127 KBytes 1.04 Mbits/sec 0 22.5 KBytes
[ 14] 3.00-4.00 sec 349 KBytes 2.86 Mbits/sec 0 49.2 KBytes
[ 14] 4.00-5.00 sec 512 KBytes 4.19 Mbits/sec 0 83.0 KBytes
[ 14] 5.00-6.00 sec 894 KBytes 7.32 Mbits/sec 0 138 KBytes
[ 14] 6.00-7.00 sec 1.30 MBytes 10.9 Mbits/sec 0 186 KBytes
[ 14] 7.00-8.00 sec 883 KBytes 7.23 Mbits/sec 0 245 KBytes
[ 14] 8.00-9.00 sec 2.01 MBytes 16.9 Mbits/sec 0 297 KBytes
[ 14] 9.00-10.00 sec 1.25 MBytes 10.5 Mbits/sec 0 423 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 14] 0.00-10.00 sec 7.45 MBytes 6.25 Mbits/sec 24 sender
[ 14] 0.00-10.00 sec 4.61 MBytes 3.87 Mbits/sec receiver
can you help me
Hi,
What is the MTU setting on your host? I once saw these results
when it was 9000 but the rest didn't support it.
Regards,
--
Szymon Trocha
Poznań Supercomputing & Netw. Center ::: NETWORK OPERATION CENTER
Tel. +48 618582022 ::: http://noc.man.poznan.pl
|
-- Thanks & Regards
Om Prakash Singh Testing
and Development Team , National Knowledge
Network 3rd Floor, Block III, Delhi IT Park, Shastri
Park, New Delhi - 110053
NKN
VoIP:7342
|
