[LU-6325] CPT bound ptlrpcd's are unimplemented

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.8.0
• Labels: patch
• Severity: 3
• Assignee: Liang Zhen (Inactive)
• Reporter: Stephen Champion

Description

ptlrpcd_select_pc() has the comment:

1. ifdef CFS_CPU_MODE_NUMA
2. warning "fix this code to use new CPU partition APIs"
3. endif

In our own experimentation on large NUMA systems, we found substantial benefits to confining the existing ptlrpcd's to the NUMA node originating IO using the taskset command to set affinity. Unfortunately, this only works for one node at a time.

To obtain the best case for all nodes, we need to create ptlrpcd's confined to each node and to select ptlrpcd's on the same node.

We plan to submit a patch against master to complete this.

Issue Links

• is related to: LU-6580 Poor read performance with many ptlrpcd threads on the client