Hi Tejun- lock_stat reports that the pool->lock kernel/workqueue.c:1483 is the highest contended lock on my test NFS client. The issue appears to be that the three NFS-related workqueues, rpciod_workqueue, xprtiod_workqueue, and nfsiod all get placed in the same worker_pool, so they have to fight over one pool lock. I notice that ib_comp_wq is allocated with the same flags, but I don't see significant contention there, and a trace_printk in __queue_work shows that work items queued on that WQ seem to alternate between at least two different worker_pools. Is there a preferred way to ensure the NFS WQs get spread a little more fairly amongst the worker_pools? Thanks in advance. -- Chuck Lever
