Fabric Manager Users Guide, Version 6.1, Revision A - QLogic

3–Fabric Manager Configuration
Configuring the QLogic Fabric Manager
Table 3-12. Congestion Control Switch Settings Parameters
Parameter
Default
Value
Description
Threshold 2 A value in the range 0 to 15. Higher values
indicate more aggressive congestion
thresholds.
PacketSize 0 Minimum packet size to mark in units of
credits.
CsThreshold 3 A value in the range 0 to 15. Higher values
indicate more aggressive credit starvation
thresholds.
CsReturnDelay 0 The return delay for credit starvation.
MarkingRate 0 The marking rate for switch congestion
VictimMarkingEnable
1 Control_Map bit0 indicates that the victim
mask is valid.
A value of 0 will cause marking of only
sources of congestion
A value of 1 will cause marking of both
sources and victims of congestion
Congestion Control Channel Adapter Settings
Congestion Control settings are applicable to third party channel adapters. When
using QLogic Host Channel Adapters, the settings for Congestion Control can be
configured with the following environment variables and may require tuning for
best performance:
PSM_DISABLE_CCA 0
PSM_CCTI_INCREMENT 1
PSM_CCTI_TIMER 1
PSM_CCTI_TABLE_SIZE 128
The parameters in Table 3-13 control Congestion Control settings applicable to
third party Channel Adapters. Default settings for a Channel Adapter are selected
to provide the best congestion control for various traffic mixes but may require
tuning for best performance.
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