Dell Emulex Family of Adapters - Manual (Page 604)

Emulex Drivers for Windows User Manual P010077-01A Rev. A
3. Configuration
NIC Driver Configuration
604
TCP Connection
Offload (IPv4) Enabled
Disabled (default) Windows Server 2008
Windows Server 2008 R2
Windows Server 2012
Windows Server 2012 R2 Note: TCP Connection Offload is
not supported on 16Gb
UCNAs.
If TCP offload is enabled, the
device offloads the entire TCP
protocol, including ACK
processing, retransmits, and
timers. Applications that prepost
receive buffers (before the data
arrives) may avoid data copies in
the receive path, which
substantially increases the system
efficiency and data rates.
Windows does not offload TCP
connections if any of the following
are enabled:
• Network Load Balancing
• IPSEC
• Network Address Translation
• NDIS 5.1 Intermediate Drivers
TCP offload must be enabled in
the Windows operating system
with the shell command:
netsh int tcp set
global chimney=enabled
This parameter appears disabled if
the firmware installed on your
device does not support TCP
connection offload. Upgrading the
firmware may resolve this issue.
View the “Statistics” property
page to ensure that TCP
connection offload is working.
Note: Both RSC (IPV4) and RSC
(IPV6) are coerced to zero if
TCP Connection Offload
(IPV4) is enabled.
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