Allied Telesis AT-2973T Entcpdack, Insmod bnx2i.ko entcpdack=0 Modprobe bnx2i entcpdack=0, Sqsize

Chapter 6: Installing the Linux Drivers

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

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