perfSONAR User Q&A and Other Discussion

[pete <>]

Hi, I've been tasked with setting up a speedtest html5 service to run on 
our perfsonar servers to replace NDT testing.  This would run through 
apache via php.  Their instructions ask the user to update several tcp 
related kernel tunings.

Does anyone have any experience or insight into how this might effect 
our perfsonar regular tests?


Here are our current standard tunings on our perfsonar mahcines:

  net.core.wmem_max = 124928
  net.ipv4.tcp_rmem = 4096      87380   4194304
  net.ipv4.tcp_wmem = 4096      16384   4194304
  net.ipv4.tcp_mem = 3079392    4105856 6158784
  net.core.netdev_max_backlog = 1000
  net.ipv4.ip_local_port_range = 32768  60999
  net.ipv4.tcp_congestion_control = cubic

Here are the CHANGES requested:

  net.core.wmem_max = 16777216
  net.ipv4.tcp_rmem = 4096 87380 16777216
  net.ipv4.tcp_wmem = 2096 65535 16777216
  net.ipv4.tcp_mem = 98304 131072 196608
  net.core.netdev_max_backlog = 250000
  net.ipv4.ip_local_port_range = 1025 61000
  net.ipv4.tcp_congestion_control=htcp


The instructions are posted here for reference: 
https://github.com/adolfintel/speedtest/issues/50

Thoughts?

Thanks,


--
Pete Greenwell
System Administrator
Missouri Research and Education Network [MOREnet]
http://www.more.net