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AT-2973SX, AT-2973T, AT-2973T/4, and AT-VNC10S Adapters Installation and User’s Guide
75
Setting Optional Properties for the bnx2i Driver
You can supply the optional parameters en_tcp_dack, error_mask1 and
error_mask2 as command line arguments to the insmod or modprobe
command for the bnx2i driver.
error_mask1 and error_mask2
Use “Config FW iSCSI Error Mask #” to configure certain iSCSI protocol
violations to be treated either as a warning or a fatal error. All fatal iSCSI
protocol violations result in session recovery (ERL 0). These are bit
masks. By default, all violations are treated as errors.
Caution
Do not use the error_mask parameter if you are not sure about the
consequences. Discuss these values with the Broadcom
development team on a case-by-case basis. This is a mechanism to
work around iSCSI implementation issues on the target side and
without proper knowledge of iSCSI protocol details, users are
advised not to experiment with these parameters.
en_tcp_dack
The “Enable TCP Delayed ACK” parameter enables or disables the TCP
delayed ACK feature on offloaded iSCSI connections. The TCP delayed
ACK feature is ENABLED by default. To set the en_tcp_dack parameter in
the bnx2i driver, enter one of the following commands:
insmod bnx2i.ko en_tcp_dack=0
or
modprobe bnx2i en_tcp_dack=0
Default: ENABLED
sq_size
Use the “Configure SQ size” parameter to select the send-queue size for
offloaded connections. The SQ size determines the maximum SCSI
commands that can be queued. Also, SQ size has a bearing on the
number of connections that can be offloaded; as QP size increases, the
number of connections supported decreases. With the default values, the
AT-2973SX, AT-2973T, AT-2973T/4, and AT-VNC10S adapters can
offload 28 connections.
Defaults: 128
Range: 32 to 128