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NFS client hangs or stalls or bad performance due to hung or stalled NFS / RPC tasks using priority wait queues, especially NFSv4.1

Solution Verified - Updated 2015-02-21T11:34:09+00:00 -

Issue

After network partition or event, we see stalled NFS tasks
NFS tasks which use RPC priority wait queues lead to poor performance
Failed RPC wakeups of RPC priority queued NFS rpc_tasks
NFS Client hang or pause occurs
NFS 4.1 hangs on failover of network or fail-over of NFS server

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
NFS Client
- NFSv4.1 is especially vulnerable due to its extensive usage of priority wait queues
Seen with NFS4.1 file layout data server and failover testing

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