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CONTAP-389090: Network processing threads may not scale under sustained workloads

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Issue

A system may experience increased network latency and poor performance when network task items take longer than 100 ms to process. Network-thread utilization can be incorrectly calculated as 0%, causing too few threads to be activated to service network queues.
A kernel panic was observed during a high-concurrency CIFS workload. The panic string was: Nblade has not responded to nitro RPCs for 120 seconds in process vifmgr

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