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Cisco Bug: CSCvi81484 - Fast queue drops observed on THK 8 X100 LC with traffic > 90%

Last Modified

Aug 16, 2018

Products (8)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9922 Router
  • Cisco IOS XR Software
  • Cisco ASR 9010 Router
  • Cisco ASR 9904 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases

6.5.1.BASE

Description (partial)

Symptom:
Fast Queue drops are seen on Tomahawk LC with traffic well below line rate ( drops seen even with 30gig traffic on a single NP)

Drops can be seen in the output of below command


RP/0/RP1/CPU0:ASR9912-B#sh qoshal default-queue interface hundredGigE 0/3/0/1 
Mon Apr 30 18:33:49.230 UTC
TY Options argc:6 
nphal_show_chk -p 2129 default-queue -m HundredGigE0_3_0_1 
Done
Interface Default Queues : HundredGigE0_3_0_1
===============================================================
Port 16 NP 0 TM Port 116
    Ingress: QID 0x180 Entity: 0/0/0/4/24/0 Priority: Priority 1 Qdepth: 0 
            StatIDs: commit/drop: 0x1180/0x868e00
            Statistics(Pkts/Bytes):
              Total Xmt 0/0 Dropped 0/0
            Fast Queue QID 0x0 Entity: 0/0/0/4/0/0 Priority: Priority 1 Qdepth: 0 
            StatIDs: commit/drop: 0x1000/0x868800
            Statistics(Pkts/Bytes):
              Total Xmt 0/0 Dropped 0/0

    Ingress: QID 0x181 Entity: 0/0/0/4/24/1 Priority: Priority 2 Qdepth: 0 
            StatIDs: commit/drop: 0x1181/0x868e04
            Statistics(Pkts/Bytes):
              Total Xmt 0/0 Dropped 0/0
            Fast Queue QID 0x1 Entity: 0/0/0/4/0/1 Priority: Priority 2 Qdepth: 0 
            StatIDs: commit/drop: 0x1001/0x868804
            Statistics(Pkts/Bytes):
              Total Xmt 0/0 Dropped 0/0

    Ingress: QID 0x183 Entity: 0/0/0/4/24/3 Priority: Priority 3 Qdepth: 0 
            StatIDs: commit/drop: 0x1183/0x868e0c
            Statistics(Pkts/Bytes):
              Total Xmt 0/0 Dropped 0/0
            Fast Queue QID 0x3 Entity: 0/0/0/4/0/3 Priority: Priority 3 Qdepth: 0 
            StatIDs: commit/drop: 0x1003/0x86880c
            Statistics(Pkts/Bytes):
              Total Xmt 52518110519181/84082733319391413 Dropped 1164977/1637151974   <<<<<<

    Ingress: QID 0x182 Entity: 0/0/0/4/24/2 Priority: Priority Normal Qdepth: 0 
            StatIDs: commit/drop: 0x1182/0x868e08
            Statistics(Pkts/Bytes):
              Total Xmt 0/0 Dropped 0/0
            Fast Queue QID 0x2 Entity: 0/0/0/4/0/2 Priority: Priority Normal Qdepth: 0 
            StatIDs: commit/drop: 0x1002/0x868808
            Statistics(Pkts/Bytes):
              Total Xmt 0/0 Dropped 0/0

    Egress: QID 0x11e000 Entity: 0/0/0/4/7680/0 Priority: Priority 1 Qdepth: 0 
            StatIDs: commit/drop: 0x1f000/0x8e0800
            Statistics(Pkts/Bytes):
              Total Xmt 0/0 Dropped 0/0

Conditions:
No specific trigger. Drops seen with production traffic lesser than line rate
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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