Allied Telesis NETEXTREME II AT-2973SX - Manual (Page 77)

AT-2973SX, AT-2973T, and AT-2973T/4 NetExtreme II Family Adapters Installation and User’s Guide
77
Note
Broadcom validation is limited to a power of 2; for example, 16, 32,
or 128.
event_coal_div
The Event Coalescing Divide Factor parameter is a performance tuning
parameter used to moderate the rate of interrupt generation by the iscsi
firmware.
Defaults: 1
Valid values: 1, 2, 4, 8
bnx2i_nopout_when_commands_active
The "iSCSI NOOP even when connection is not idle" parameter enables
the offload initiator to send iSCSI NOP-OUT on wire even when the link is
not truly idle. This parameter was introduced to avoid unnecessary
session recoveries induced by some older targets when iSCSI NOP-OUT
and iSCSI CMD pdus are intermixed. Newer iSCSI target systems are
immune to this condition and this parameter is turned ON for quite some
time.
Defaults: 1
Values: Binary parameter, 0/1
The parameters can also be set in the modprobe.conf command. See
the man page for more information.
Checking the
bnx2 Driver
Defaults
The bnx2 driver defaults to the following settings:
Speed: Autonegotiation with all speeds advertised
Flow Control: Autonegotiation with RX and TX advertised
MTU: 1500 (range is 46–9000)
RX Ring Size: 255 (range is 0–4080)
RX Jumbo Ring Size: 0 (range 0–16320) adjusted by the driver based on
MTU and RX Ring Size
TX Ring Size: 255 (range is (MAX_SKB_FRAGS+1)–255).
MAX_SKB_FRAGS varies on different kernels and different architectures.
On a 2.6 kernel for x86, MAX_SKB_FRAGS is 18.
Coalesce RX Microseconds: 18 (range is 0–1023)
Coalesce RX Microseconds IRQ: 18 (range is 0–1023)