Dell Emulex Family of Adapters - Manual (Page 605)

Emulex Drivers for Windows User Manual P010077-01A Rev. A
3. Configuration
NIC Driver Configuration
605
TCP Offload
Optimization Optimize Latency
Optimize Throughput
(default) Windows Server 2008
Windows Server 2008 R2
Windows Server 2012
Windows Server 2012 R2 This parameter only applies to TCP
connection offload, which must be
enabled in the “Protocol Offloads”
section.
Most applications perform better
with TCP Offload Optimization set
to “Optimize Throughput” which
handles large data transfers with
minimal CPU impact.
Setting this parameter to
“Optimize Latency” causes receive
data to be delivered to the
application without waiting for a
TCP PSH. This causes additional
receive indications that typically
decrease total throughput.
Transmit Buffers 64–256, inclusive
The default setting is 256. Windows Server 2008
Windows Server 2008 R2
Windows Server 2012
Windows Server 2012 R2 Transmit Buffers sets the number
of Ethernet transmits that may be
posted to the hardware at any
given time.
The default value is sufficient to
achieve maximum performance.
Reducing this value conserves
system memory.
Transmit CPU “Not Present” or a value from
0 through (number of CPUs
-1).
Optional. There is no default
setting. Windows Server 2008
Windows Server 2008 R2
Windows Server 2012
Windows Server 2012 R2 Sets the CPU to be used to process
transmit completions. By default,
the driver intelligently chooses a
CPU in the system, so this
parameter should only be set for
advanced performance tuning.
Transmit Side
Scaling (TSS) Enabled
Disabled Windows Server 2008
Windows Server 2008 R2
Windows Server 2012
Windows Server 2012 R2 TSS distributes transmit
completions to be processed on
multiple CPUs in parallel. It uses
the RSS CPU table for distribution
and therefore requires RSS to be
enabled.
UDP Checksum
Offload (IPv4) Disabled
RX and TX Enabled (default)
RX Enabled
TX Enabled Windows Server 2008
Windows Server 2008 R2
Windows Server 2012
Windows Server 2012 R2 UDP offload checksum settings
offload the transmit and/or
receive IPv4 UDP checksum
computation.
Offloading checksums increases
system efficiency.
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