[LU-15957] LNet: add latency stats to lnet_selftest output

• Type: Improvement
• Resolution: Unresolved
• Priority: Minor
• Labels: lnetselftest

Epic/Theme

lnet

• Assignee: Cyril Bordage
• Reporter: Serguei Smirnov

Description

Although lnet_selftest is able to run "ping" tests (vs. "brw"), it doesn't appear to be collecting and reporting any data useful for analysing network latency.

Use this ticket for tracking activities on adding network latency data collection and stats reporting to lnet_selftest.

 

Issue Links

• is related to: LU-16832 Alternative option of "tc" command for lnet
• is related to: LU-16833 LNet: add latency stats to "lnetctl ping"

Comments

[Shuichi Ihara]

Not only lnet_selftest, but it also would be nice to print latency even in lnet ping.. it's same idea of ping command.

# ping c01
PING c01 (10.128.13.150) 56(84) bytes of data.
64 bytes from c01 (10.128.13.150): icmp_seq=1 ttl=64 time=0.346 ms
64 bytes from c01 (10.128.13.150): icmp_seq=2 ttl=64 time=0.189 ms

So, it would have "lctl ping (or lnetctl ping <NID> -c count", then print latency of each round-trip.