[LU-10291] remove concurrent_sends tunable

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.11.0
• Severity: 3
• Assignee: Amir Shehata (Inactive)
• Reporter: Amir Shehata (Inactive)

Description

Concurrent sends tunable was intended to limit the number of in-flight transfers per connection. However queue depth does the exact same job. So for example if the queue depth is negotiated to 16 and concurrent_sends is set to 32, the maximum number of in-flight transfers doesn't exceed 16. There is no need to keep concurrent_sends around since it doesn't add any unique functionality.

Issue Links

• is related to: LU-10459 LBUG o2iblnd_cb.c:991:kiblnd_check_sends_locked()) ASSERTION( conn->ibc_nsends_posted <= conn->ibc_queue_depth ) failed:
• is related to: LU-11931 RDMA packets sent from client to MGS are timing out