[LU-12339] LNet Health: selecting loopback interface for sending

• Type: Technical task
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.13.0, Lustre 2.12.3
• Assignee: Amir Shehata (Inactive)
• Reporter: Amir Shehata (Inactive)

Description

In the following scenario

Lustre->LNetPrimaryNID with 0@lo
Discover is initiated on 0@lo
The peer is created with 0@lo and <addr>@<net>
The interface health of the peer's <addr>@<net> is decremented
LNetPut() to self
selection algorithm selects 0@lo to send to

This exposes an issue where we try and go through the peer credit management algorithm, but because there are no credits associated with 0@lo we end up indefinitely queuing the message. ptlrpc will then get stuck waiting for send completion on the message.

This was exposed via conf-sanity 32

 

Comments

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/36040/
Subject: LU-12339 lnet: select LO interface for sending
Project: fs/lustre-release
Branch: b2_12
Current Patch Set:
Commit: bab7da820e36d3c00e888704fc2c8d6022786c42

[Gerrit Updater]

Minh Diep ([e-mail]) uploaded a new patch: https://review.whamcloud.com/36040
Subject: LU-12339 lnet: select LO interface for sending
Project: fs/lustre-release
Branch: b2_12
Current Patch Set: 1
Commit: 3d0d0149b832804c36d432370e23ed91b8ec43c8

[Joseph Gmitter (Inactive)]

Work has landed as part of the MR Routing merge commit: https://review.whamcloud.com/#/c/34983/

[Gerrit Updater]

Amir Shehata ([e-mail]) merged in patch https://review.whamcloud.com/34957/
Subject: LU-12339 lnet: select LO interface for sending
Project: fs/lustre-release
Branch: multi-rail
Current Patch Set:
Commit: 69d1535ebdac139c6b19db2bca5f65663fe88467

[Gerrit Updater]

Amir Shehata ([e-mail]) uploaded a new patch: https://review.whamcloud.com/34957
Subject: LU-12339 lnet: select LO interface for sending
Project: fs/lustre-release
Branch: multi-rail
Current Patch Set: 1
Commit: d4fb79b10c186dbec3263885773e4b48f0e7cd6e