Checksum Offload; Ieee 802.1P Qos Tagging - Qlogic FastLinQ 3400 Series User Manual

15–QLogic Teaming Services
Teaming and Other Advanced Networking Properties
Table 15-6. Advanced Adapter Properties and Teaming Support
Jumbo Frames
IEEE 802.1Q VLANs
Preboot Execution environment (PXE)
a
All adapters on the team must support this feature. Some adapters may not support this feature if
ASF/IPMI is also enabled.
b
Must be supported by all adapters in the team.
c
Only for QLogic adapters.
d
As a PXE sever only, not as a client.
A team does not necessarily inherit adapter properties; rather various properties
depend on the specific capability. For instance, an example would be flow control,
which is a physical adapter property and has nothing to do with QLASP, and will
be enabled on a particular adapter if the miniport driver for that adapter has flow
control enabled.
NOTE
All adapters on the team must support the property listed in
the team to support the property.

Checksum Offload

Checksum Offload is a property of the QLogic network adapters that allows the
TCP/IP/UDP checksums for send and receive traffic to be calculated by the
adapter hardware rather than by the host CPU. In high-traffic situations, this can
allow a system to handle more connections more efficiently than if the host CPU
were forced to calculate the checksums. This property is inherently a hardware
property and would not benefit from a software-only implementation. An adapter
that supports Checksum Offload advertises this capability to the operating system
so that the checksum does not need to be calculated in the protocol stack.
Checksum Offload is only supported for IPv4 at this time.

IEEE 802.1p QoS Tagging

The IEEE 802.1p standard includes a 3-bit field (supporting a maximum of 8
priority levels), which allows for traffic prioritization. The QLASP intermediate
driver does not support IEEE 802.1p QoS tagging.
Adapter Properties
Supported by Teaming Virtual
200
Adapter
b
Yes
c
Yes
d
Yes
Table 15-6 for
83840-546-00 E