Dell Intel PRO Family of Adapters - Manual (Page 67)

Parameter Name Valid
Range/Settings Default Description
RxIntDelay 0-65535 (0=off) 0 This value delays the generation of receive interrupts in
units of 1.024 microseconds. Receive interrupt reduction
can improve CPU efficiency if properly tuned for specific net-
work traffic. Increasing this value adds extra latency to frame
reception and can end up decreasing the throughput of TCP
traffic. If the system is reporting dropped receives, this value
may be set too high, causing the driver to run out of avail-
able 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 auto-
matically reset, restoring the network connection.
To eliminate the potential for the hang ensure that
RxIntDelay is set to zero.
RxAbsIntDelay 0-65535 (0=off) 8 This value, in units of 1.024 microseconds, 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 RxIntDelay, may
improve traffic throughput in specific network conditions.
(Supported on Intel 82540, 82545, and later adapters only.)
TxIntDelay 0-65535 (0=off) 8 This value delays the generation of transmit interrupts in
units of 1.024 microseconds. Transmit interrupt reduction
can improve CPU efficiency if properly tuned for specific net-
work traffic. If the system is reporting dropped transmits, this
value may be set too high causing the driver to run out of
available transmit descriptors.
TxAbsIntDelay 0-65535 (0=off) 32 This value, in units of 1.024 microseconds, limits the delay in
which a transmit interrupt is generated. Useful only if
TxIntDelay is non-zero, this value ensures that an interrupt is
generated after the initial packet is sent on the wire within
the set amount of time. Proper tuning, along with TxIntDelay,
may improve traffic throughput in specific network con-
ditions.
(Supported on Intel 82540, 82545 and later adapters only.)
copybreak 0-xxxxxxx (0=off) 256 Usage: modprobe e1000e.ko copybreak=128
Driver copies all packets below or equaling this size to a
fresh receive buffer before handing it up the stack.
This parameter is different than other parameters, in that it is
a single (not 1, 1, 1, etc.) parameter applied to all driver
instances and it is also available during runtime at /sys/-
module/e1000e/parameters/copybreak.
SmartPower-
DownEnable 0-1 0 (dis-
abled) This value allows the PHY to turn off in lower power states.
This parameter can be turned off in supported chipsets.
KumeranLockLoss 0-1 1
(enable-
d) This value skips resetting the PHY at shutdown for the initial
silicon releases of ICH8 systems.