ibccconfig8
Configure congestion control settings
Usage
ibccconfig {[common_options]
[-c
cckey]
<op>
<lid | guid>
[port]}
Overview
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.
Options
- 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
-
-d -
raise the IB debugging level. May be used several times (-ddd or -d -d -d).
-
-e -
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.
-
-Y, --pkey-idx <idx> -
P_Key table index (0-65535, default 0) used for the outgoing SA/GMP MADs. SMP (SMI directed-route/LID-routed) MADs always use P_Key index 0.
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:
1.
|
the first port that is ACTIVE. |
|---|---|
2.
|
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
Examples
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
Files
Config file
/etc/infiniband-diags/ibdiag.conf
A global config file is provided to set some of the common options for all tools. See supplied config file for details.
Releases
7 releases since Debian 8 (Jessie); the text changed 4 times.
--pkey-idx since Arch Linux 2026-11-01;
-Y since Arch Linux 2026-11-01.