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Cisco Bug: CSCut04270 - NP_COMMON interrupt increments at high traffic rate - no drops

Last Modified

Jan 10, 2017

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

5.3.0.BASE

Description (partial)

Symptom:
High CPU utilisation in prm_server_to process and high rate of NP_COMMON interrupts. No traffic drops are observed as a consequence.

RP/0/RP0/CPU0:R1#sh controllers np interrupts 28 np2 location 0/2/CPU0
		Node: 0/2/CPU0:
----------------------------------------------------------------
Ch        Interrupt Name            Id     Cnt   Brst Cs Msk  Callback
-- ------------------------------ ---- ------- ------ -- ---  --------
 2                      NP_COMMON   28 614877015      0  Y   N  42da88e


RP/0/RP0/CPU0:R1#sh processes cpu location 0/2/CPU0 | i "PID|prm_ser"
Fri Feb 20 16:45:59.381 GMT
PID    1Min    5Min    15Min Process
151633  17%     17%      17% prm_server_to

Conditions:
Traffic rate on HundredGig interface is beyond 90% of line rate.    This issue is specific to Tomahawk linecards.
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