ibccconfig man page

IBCCCONFIG — configure congestion control settings


ibccconfig [common_options] [-c cckey] <op> <lid|guid> [port]


ibccconfig supports the configuration of congestion control settings on switches and HCAs.

WARNING -- You should understand what you are doing before using this tool. Misuse of this tool could result in a broken fabric.


Current supported operations and their parameters:

CongestionKeyInfo (CK) <lid|guid> <cckey> <cckeyprotectbit> <cckeyleaseperiod> <cckeyviolations> SwitchCongestionSetting (SS) <lid|guid> <controlmap> <victimmask> <creditmask> <threshold> <packetsize> <csthreshold> <csreturndelay> <markingrate> SwitchPortCongestionSetting (SP) <lid|guid> <portnum> <valid> <control_type> <threshold> <packet_size> <cong_parm_marking_rate> CACongestionSetting (CS) <lid|guid> <port_control> <control_map> <ccti_timer> <ccti_increase> <trigger_threshold> <ccti_min> CongestionControlTable (CT) <lid|guid> <cctilimit> <index> <cctentry> <cctentry> ...

--cckey, -c, <cckey>
Specify a congestion control (CC) key.  If none is specified, a key of 0 is used.

Debugging flags


raise the IB debugging level. May be used several times (-ddd or -d -d -d).


show send and receive errors (timeouts and others)

-h, --help      show the usage message

-v, --verbose

increase the application verbosity level. May be used several times (-vv or -v -v -v)

-V, --version     show the version info.

Addressing Flags

-G, --Guid     The address specified is a Port GUID

-L, --Lid   The address specified is a LID

-s, --sm_port <smlid>     use 'smlid' as the target lid for SA queries.

Port Selection flags

-C, --Ca <ca_name>    use the specified ca_name.

-P, --Port <ca_port>    use the specified ca_port.

Local port Selection

Multiple port/Multiple CA support: when no IB device or port is specified (see the "local umad parameters" below), the libibumad library selects the port to use by the following criteria:


the first port that is ACTIVE.


if not found, the first port that is UP (physical link up).

If a port and/or CA name is specified, the libibumad library attempts to fulfill the user request, and will fail if it is not possible.

For example:

ibaddr                 # use the first port (criteria #1 above)
ibaddr -C mthca1       # pick the best port from "mthca1" only.
ibaddr -P 2            # use the second (active/up) port from the first available IB device.
ibaddr -C mthca0 -P 2  # use the specified port only.

Configuration flags

-y, --m_key <key>

use the specified M_key for requests. If non-numeric value (like 'x') is specified then a value will be prompted for.

--config, -z  <config_file> Specify alternate config file.

Default: /etc/infiniband-diags/ibdiag.conf


ibccconfig SwitchCongestionSetting 2 0x1F 0x1FFFFFFFFF 0x0 0xF 8 0 0:0 1  # Configure Switch Congestion Settings
ibccconfig CACongestionSetting 1 0 0x3 150 1 0 0                          # Configure CA Congestion Settings to SL 0 and SL 1
ibccconfig CACongestionSetting 1 0 0x4 200 1 0 0                          # Configure CA Congestion Settings to SL 2
ibccconfig CongestionControlTable 1 63 0 0:0 0:1 ...                      # Configure first block of Congestion Control Table
ibccconfig CongestionControlTable 1 127 0 0:64 0:65 ...                   # Configure second block of Congestion Control Table


Config File


A global config file is provided to set some of the common options for all tools.  See supplied config file for details.


Albert Chu

< chu11@llnl.gov >


OpenIB Diagnostics