[gpfsug-discuss] VERBS RDMA issue

Tushar Pathare tpathare at sidra.org
Sun May 21 09:40:42 BST 2017


Hello Team,

We are facing a lot of messages waiters  related to waiting for conn rdmas < conn maxrdmas<https://www.mail-archive.com/search?l=gpfsug-discuss@spectrumscale.org&q=subject:%22Re%5C%3A+%5C%5Bgpfsug%5C-discuss%5C%5D+waiting+for+conn+rdmas+%3C+conn+maxrdmas%22&o=newest>

Is there some recommended settings to resolve this issue.?
Our config for RDMA is as follows for 140 nodes(32 cores each)


VERBS RDMA Configuration:
  Status                              : started
  Start time                          : Thu
  Stats reset time                    : Thu
  Dump time                           : Sun
  mmfs verbsRdma                      : enable
  mmfs verbsRdmaCm                    : disable
  mmfs verbsPorts                     : mlx4_0/1 mlx4_0/2
  mmfs verbsRdmasPerNode              : 3200
  mmfs verbsRdmasPerNode (max)        : 3200
  mmfs verbsRdmasPerNodeOptimize      : yes
  mmfs verbsRdmasPerConnection        : 16
  mmfs verbsRdmasPerConnection (max)  : 16
  mmfs verbsRdmaMinBytes              : 16384
  mmfs verbsRdmaRoCEToS               : -1
  mmfs verbsRdmaQpRtrMinRnrTimer      : 18
  mmfs verbsRdmaQpRtrPathMtu          : 2048
  mmfs verbsRdmaQpRtrSl               : 0
  mmfs verbsRdmaQpRtrSlDynamic        : no
  mmfs verbsRdmaQpRtrSlDynamicTimeout : 10
  mmfs verbsRdmaQpRtsRnrRetry         : 6
  mmfs verbsRdmaQpRtsRetryCnt         : 6
  mmfs verbsRdmaQpRtsTimeout          : 18
  mmfs verbsRdmaMaxSendBytes          : 16777216
  mmfs verbsRdmaMaxSendSge            : 27
  mmfs verbsRdmaSend                  : yes
  mmfs verbsRdmaSerializeRecv         : no
  mmfs verbsRdmaSerializeSend         : no
  mmfs verbsRdmaUseMultiCqThreads     : yes
  mmfs verbsSendBufferMemoryMB        : 1024
  mmfs verbsLibName                   : libibverbs.so
  mmfs verbsRdmaCmLibName             : librdmacm.so
  mmfs verbsRdmaMaxReconnectInterval  : 60
  mmfs verbsRdmaMaxReconnectRetries   : -1
  mmfs verbsRdmaReconnectAction       : disable
  mmfs verbsRdmaReconnectThreads      : 32
  mmfs verbsHungRdmaTimeout           : 90
  ibv_fork_support                    : true
  Max connections                     : 196608
  Max RDMA size                       : 16777216
  Target number of vsend buffs        : 16384
  Initial vsend buffs per conn        : 59
  nQPs                                : 140
  nCQs                                : 282
  nCMIDs                              : 0
  nDtoThreads                         : 2
  nextIndex                           : 141
  Number of Devices opened            : 1
    Device                            : mlx4_0
      vendor_id                       : 713
      Device vendor_part_id           : 4099
      Device mem register chunk       : 8589934592 (0x200000000)
      Device max_sge                  : 32
      Adjusted max_sge                : 0
      Adjusted max_sge vsend          : 30
      Device max_qp_wr                : 16351
      Device max_qp_rd_atom           : 16
      Open Connect Ports              : 1
        verbsConnectPorts[0]          : mlx4_0/1/0
          lid                         : 129
          state                       : IBV_PORT_ACTIVE
          path_mtu                    : 2048
          interface ID                : 0xe41d2d030073b9d1
          sendChannel.ib_channel      : 0x7FA6CB816200
          sendChannel.dtoThreadP      : 0x7FA6CB821870
          sendChannel.dtoThreadId     : 12540
          sendChannel.nFreeCq         : 1
          recvChannel.ib_channel      : 0x7FA6CB81D590
          recvChannel.dtoThreadP      : 0x7FA6CB822BA0
          recvChannel.dtoThreadId     : 12541
          recvChannel.nFreeCq         : 1
          ibv_cq                      : 0x7FA2724C81F8
          ibv_cq.cqP                  : 0x0
          ibv_cq.nEvents              : 0
          ibv_cq.contextP             : 0x0
          ibv_cq.ib_channel           : 0x0

Thanks


Tushar B Pathare MBA IT,BE IT
Bigdata & GPFS
Software Development & Databases
Scientific Computing
Bioinformatics Division
Research

"What ever the mind of man can conceive and believe, drill can query"

Sidra Medical and Research Centre
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