4-8
Add-on Card User's Guide
Parameter
Name
Valid Range/Set-
tings
Default Description
RxIntDelay
0-65535 (0=off)
0
This value delays the generation of
receive interrupts in units of 1.024
microseconds. Receive interrupt re-
duction can improve CPU effi ciency
if properly tuned for specifi c network
traffi c. Increasing this value adds
extra latency to frame reception and
can end up decreasing the through-
put of TCP traffi c. If the system is re-
porting dropped receives, this value
may be set too high, causing the
driver to run out of available receive
descriptors.
CAUTION: When setting RxIntDelay
to a value other than 0, adapters
may hang (stop transmitting) under
certain network conditions. If this
occurs a NETDEV WATCHDOG
message is logged in the system
event log. In addition, the controller
is automatically reset, restoring the
network connection. To eliminate the
potential for the hang ensure that
RxIntDelay is set to zero.
RxAbsIntDe-
lay
0-65535 (0=off)
128
This value, in units of 1.024 micro-
seconds, limits the delay in which a
receive interrupt is generated. Useful
only if RxIntDelay is non-zero, this
value ensures that an interrupt is
generated after the initial packet is
received within the set amount of
time. Proper tuning, along with RxInt-
Delay, may improve traffi c throughput
in specifi c network conditions.
This parameter is supported only on
82540, 82545 and later adapters.
