Q-Logic 3000, 3100 Ethtool Utility, 1. modprobe Command Optional Parameters, Range, Description

8–Linux Driver Installation and Configuration Linux QLogic Adapter Driver Options

The parameters are listed in Table 8-1.

Table 8-1. modprobe Command Optional Parameters

Parameter	Description	Default	Range
tx_desc	Sets the size of the command descrip-	1024	256–1024
	tor rings (transmit).		(must be
			power of two)
jumbo_desc_1g	Sets the size of the receive ring for	1024	64–1024
	jumbo frames (1GbE ports).	(x86 64-bit)	(must be
		512	power of two)
		(x86 32-bit)
jumbo_desc	Sets the size of the receive ring for	1024	64–1024
	jumbo frames (10GbE ports).		(must be
			power of two)
rdesc_1g	Sets the size of the receive ring for	8192	64–8192
	normal packets (1GbE ports).	(x86 64-bit)	(must be
	For firmware version 4.0.xyz, the max-	2048	power of two)
	imum size is 8192.	(x86 32-bit)
rdesc_10g	Sets the size of the receive ring for	8192	64–8192
	normal packets (10GbE ports).	(x86 64-bit)	(must be
	For firmware version 4.0.xyz, the max-	4096	power of two)
	imum size is 8192.	(x86 32-bit)
use_msi	Enables MSI interrupts.	1	0: Disabled
			1: Enabled
use_msi_x	Enables MSIx interrupts.	1	0: Disabled
	This parameter is available only in		1: Enabled
	kernel versions later than 2.6.8. When
	this parameter is enabled, it takes pre-
	cedence over MSI interrupts and the
	use_msi parameter is ignored.
rss_enable	Enables receive side scaling. This	1	0: Disabled
	parameter is available only when		1: Enabled
	MSI-X interrupts are enabled.

Ethtool Utility

The ethtool utility checks and configures additional driver options. See the nx_nic Linux man pages for driver option configuration examples. See the ethtool Linux man pages for additional details. Here is an example command:

% ethtool -K eth[n] tso off

NE0154601-00 B 8-7