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Re: [perfsonar-user] Problem on the throughput test results


Chronological Thread 
  • From: Mark Foster <>
  • To: perfsonar-user <>, Xu Chen <>, "Wu, Xiaoban" <>
  • Subject: Re: [perfsonar-user] Problem on the throughput test results
  • Date: Thu, 24 Sep 2015 12:05:03 -0700

ping -M do -s 8972

the "-M do" is important in most contexts, since it says "prohibit
fragmentation". If it's not 9000-byte clean path, you won't get a ping response.

On 9/24/2015 11:52 AM, Jason Zurawski wrote:
Greetings;

Besides the end hosts being configured for Jumbo frames, the entire broadcast
domain needs to be working with jumbo frames as well (e.g. the switch, and
devices populating it). If something is mis-configured, the application will
not function. You can test to be sure you have a clean 9000 byte path with
'ping -s 8972'.

Thanks;

-jason

Xu Chen wrote:
Their MTU size is also 9000.

On Sep 24, 2015, at 2:35 PM, Brian Jones
<

<mailto:>>
wrote:

You may want to check the testing end point sides mtu size.

fwiw

--
Brian

On Thu, Sep 24, 2015 at 2:26 PM, Xu Chen
<

<mailto:>>
wrote:

Hello all,

I use 10G NIC on my perfSONAR node. When I start a tcp throughput test
from my node to another node, the throughput is 1.2 Gbps (before I use 10G
NIC, it’s 911Mbps). After I reserve the the source and destination, the
result becomes 0.4 Gbps. I use default TCP window size and MTU is 1500. What
do I miss on the configuration (perfSONAR toolkit or NIC)?

Another problem is when I change MTU from 1500 to 9000 (ifconfig eth0 mtu
9000 up), I met the following problem when starting a test.
bwctl: Using tool: iperf
bwctl: 26 seconds until test results available

RECEIVER START
------------------------------------------------------------
Server listening on TCP port 5191
Binding to local address 140.221.68.2
TCP window size: 87380 Byte (default)
------------------------------------------------------------
[ 15] local 140.221.68.2 port 5191 connected with 129.63.79.200 port 47521
Waiting for server threads to complete. Interrupt again to force quit.

bwctl: local tool did not complete in allocated time frame and was killed
What should I do so that I can use jumbo frame?

Thanks,

Chen Xu




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