User Manual

OpenSM – Subnet ManagerRev 2.2-1.0.1
Mellanox Technologies
218
• When number of errors exceeds 'max_errors' of send/receive errors or timeouts in less
than 'error_window' seconds, the CC MGR will abort and will allow OpenSM to pro-
ceed. To do so, set the following parameter:
max_errors
error_window
• The values are:
max_errors = 0: zero tollerance - abort configuration on first error
error_window = 0: mechanism disabled - no error checking.[0-48K]
• The default is: 5
8.9.4.1 Congestion Control Manager Options File
Table 25 - Congestion Control Manager General Options File
Option File Description Values
enable Enables/disables Congestion Control mechanism
on the fabric nodes.
Values: <TRUE | FALSE>
Default: True
num_hosts Indicates the number of nodes. The CC table val-
ues are calculated based on this number.
Values: [0-48K]
Default: 0 (base on the CCT
calculation on the current
subnet size)
Table 26 - Congestion Control Manager Switch Options File
Option File Description Values
threshold Indicates how aggressive the congestion mark-
ing should be.
[0-0xf]
• 0 - no packet marking,
• 0xf - very aggressive
Default: 0xf
marking_rate The mean number of packets between marking
eligible packets with a FECN
Values: [0-0xffff]
Default: 0xa
packet_size Any packet less than this size [bytes] will not be
marked with FECN.
Values: [0-0x3fc0]
Default: 0x200
Table 27 - Congestion Control Manager CA Options File
Option File Desctiption Values
port_control Specifies the Congestion Control attribute for
this port
Values:
• 0 - QP based congestion control,
• 1 - SL/Port based congestion con-
trol
Default: 0