CPU High Load - ptlrpcd rcv loop 100%

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ptlrpcd_rcv loop CPU 100%

Seems related to: https://jira.hpdd.intel.com/browse/LU-5787 Drop caches to resolve; *NOTE* Only do this when no users are running jobs - something wierd happened when we did this on a compute node with a user job. Clear jobs first then drop caches 

   lctl set_param ldlm.namespaces.*.lru_size=clear
   or
   echo 1 > /proc/sys/vm/drop_caches
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