Dell Brocade Adapters - Manual (Page 244)

216 Brocade Adapters Installation and Reference Manual
53-1002144-01
Network driver parameters
A
Linux
Table 38 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.