Dell Emulex Family of Adapters - Manual (Page 606)

Emulex Drivers for Windows User Manual P010077-01A Rev. A
3. Configuration
NIC Driver Configuration
606
UDP Checksum
Offload (IPv6) Disabled
RX and TX Enabled (default)
RX Enabled
TX Enabled Windows Server 2008
Windows Server 2008 R2
Windows Server 2012
Windows Server 2012 R2 User Datagram Protocol (UDP)
offload checksum settings offload
the transmit and/or receive IPv6
UDP checksum computation.
Offloading checksums increases
system efficiency.
Virtual Machine
Queues Enabled (default)
Disabled Note: For OCe11102,
LPe16202, and
OCe14000 only.
VMQs require Windows
Server 2008 R2 or later
with Hyper-V.
VMQs are dedicated hardware
receive queues for virtual
machines that filter receive
packets based on the destination
MAC address and/or VLAN. Receive
buffers can be allocated for each
queue from VM memory.
This improves network throughput
by distributing processing of
network traffic for multiple VMs
among multiple processors. It
reduces CPU utilization by
offloading receive packet filtering
to NIC hardware. VMQs prove
beneficial when 4 or more VMs are
in use.
Virtual Machine
Queues Lookahead
Split Enabled (default)
Disabled Note: For OCe11102
UCNAs only. Not
applicable for
LPe16202 and
OCe14000-series
adapters.
Windows Server 2008 R2
VMQ enables direct DMA to VM
memory. Lookahead improves
packet steering performance by
PCI prefetching adjacent header
buffer into a cache when
examining a packet. Header
buffers are continuous in physical
memory since they belong to one
pool.
For OCe11102, Lookahead split
requires Advanced Mode Support
and is enabled in the BIOS
controller configuration.
Note: Lookahead split is not
supported for jumbo
frames.
Virtual Machine
Queues Transmit Enabled (default)
Disabled Note: For OCe11102,
LPe16202, and
OCe14000-series
adapters only.
Windows Server 2008 R2
Windows Server 2012
Windows Server 2012 R2
If this option is enabled with
VMQs, separate transmit queues
are created for each VM network
interface. Send and receive
interrupts for a VM network
interface are processed on the
same CPUs.
Separate transmit queues increase
system overall CPU utilization, but
offer greater system scalability.
Table 3-3 Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, and Windows Server 2012 R2 NIC
Driver Options (Continued)
Option Name Acceptable Values
Supported Operating
Systems
Definition