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Chapter 6: Installing the Linux Drivers
76
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 and AT-2973T, and AT—2973T/4 adapters can offload 28
connections.
Defaults: 128
Range: 32 to 128
Note
Broadcom validation is limited to a power of 2; for example, 32, 64,
or 128.
rq_size
Use the "Configure RQ size" parameter to choose the size of
asynchronous buffer queue size per offloaded connections. The RQ size
is not required to be greater than 16 because it is used to place iSCSI
ASYNC/NOP/REJECT messages and SCSI sense data.
Defaults: 16
Range: 16 to 32