[LU-7614] OST r/o cache conflicts with o2ib map_on_demand feature

• Type: Bug
• Resolution: Unresolved
• Priority: Critical
• Affects Version/s: Lustre 2.7.0
• Labels: lnet
• Severity: 3
• Assignee: WC Triage
• Reporter: Alexey Lyashkov

Description

FMR pool mapping assume a page list isn't changed after first registration, otherwise it kill own cache and use a ib_map_phys_fmr in loop with some additional overhead related to the pool handling.