Users Guide

8–VMware Driver Software
Driver Parameters
Doc No. BC0054508-00 Rev. R
January 21, 2021 Page 71 Copyright © 2021 Marvell
sq_size
Use the sq_size parameter to choose send queue size for offloaded
connections and SQ size determines the maximum SCSI commands that can be
queued. SQ size also has a bearing on the quantity of connections that can be
offloaded; as QP size increases, the quantity of connections supported
decreases. With the default values, the BCM5708 adapters can
offload 28 connections.
Default: 128
Range: 32 to 128
Note that Marvell validation is limited to a power of 2; for example, 32, 64, and
128.
rq_size
Use the rq_size parameter to choose the size of asynchronous buffer queue
size per offloaded connections. RQ size is not required greater than 16 as it is
used to place iSCSI ASYNC/NOP/REJECT messages and SCSI sense data.
Default: 16
Range: 16 to 32
Note that Marvell validation is limited to a power of 2; for example, 16 or 32.
event_coal_div
The event_coal_div (event coalescing divide factor) parameter is a
performance-tuning parameter that moderates the rate of interrupt generation by
the iSCSI firmware.
Default: 2
Valid values: 1, 2, 4, 8
Event Coalescing Divide Factor is a performance-tuning parameter used to
moderate the rate of interrupt generation by the iSCSI firmware.
Default: 2
Valid values: 1, 2, 4, 8
last_active_tcp_port
The last_active_port parameter is a status parameter that indicates the last
TCP port number used in the iSCSI offload connection.
Default: N/A
Valid values: N/A
This parameter is read-only.