Linux – Dell Brocade Adapters User Manual
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216
Brocade Adapters Installation and Reference Manual
53-1002144-01
Network driver parameters
A
Linux
describes the instance-specific network configuration parameters available for Linux
hosts.
TABLE 38
Network driver configuration parameters
Function
Default Value
Possible Values
Method to Configure
Notes
Log Level
3
0 = EMERG
3 = Warning
6 = INFO
7 = DEBUG
Module parameter
(bnad_log_level)
Linux log level
Interrupt
Moderation
(Set for receive
interrupts)
On
On
Off
ethtool -C command
Reduces context switching
and CPU utilization. When
enabled, the hardware will
not generate an interrupt
immediately after it
receives a packet, but
waits for more packets or a
time-out to expire
Jumbo Packet Size 1500
1500-9000 bytes
ifconfig command
Sets MTU size. Size must
not be greater than size set
on FCoE switch
TCP-UDP
Checksum Offload
(instance-specific
parameter)
Enable
Enable
Disable
ethtool-K command
(offload -K ethX)
Enable or disable transmit
and receive checksum
offload.
TCP Segmentation
Offload (TSO)
(instance-specific
parameter)
Enable
Enable
Disable
ethtool K command
(ethtool -K ethX)
MSI-X (Message
Signaled
Interrupts
Extended)
1
1 = Enable
0 = Disable
Module parameter
(bnad_msix)
Parameter is only
supported on 2.6 kernels
that support MSI.
Locally
Administered
Address (MAC)
NA
Hexadecimal digits
for MAC address.
ifconfig hw ether
command
Overrides the burned-in
MAC address.
Interrupt
Coalescing
1
1.
The default values are optimized for this feature and should only be modified by expert users with knowledge of
how values change operation.
60 rx-usecs
100 tx-usecs
32 tx-frames
6 rx-frames
2
2.
Modifying rx-frame values have no effect at this time as the inter-pkt mechanism is not enabled for the receive
side.
1-1280 (8 bits)
0-1280 (8 bits)
0-256 (8 bits)
0-256 (8 bits)
ethtool -C command
(coalescing ethX)
Legacy Ethernet
pause
NA
autoneg: off, on
rx: off, on
tx: off, on
ethtool -A command
Flow control mechanism
for Ethernet.