Installation guide

Alacritech Accelerator Users Guide: Microsoft Windows Edition 3-16
Jumbo Packet
The standard maximum Ethernet frame size, including MAC addresses, Length/Type
field, and 1500-byte payload, and Frame Check Sequence (FCS) is 1518 bytes. Using
jumbo frames with larger payloads improves network efficiency by reducing the overall
number of frames. Setting the value to 9014 allows the Accelerator to send and re-
ceive frames up to 9014 bytes in length (9018 bytes including the FCS).When To avoid
frame loss, all devices in the data path much support jumbo frames. The default value
is 1514 (standard frame size, not counting the FCS).
Large Send Offload Version 1 (IPv4)
Large Send Offload (LSO), also known as TCP Segmentation Offload (TSO), is a
“stateless” offload technology supported by the Alacritech Accelerator. When enabled,
the Accelerator performs the task of segmenting the data into TCP datagrams, saving
cycles from the host CPU. Version 1 supports a maximum segment offload size of
64kb. As with IP Checksum Offload, this only applies when the Accelerator has the
TCP Offload disabled or the Microsoft stack has chosen not to offload a TCP connec-
tion to the Alacritech Accelerator. The default value is Enabled.
Large Send Offload Version 2 (IPv4)
Large Send Offload (LSO), also known as TCP Segmentation Offload (TSO), is a
“stateless” offload technology supported by the Alacritech Accelerator. When enabled,
the Accelerator performs the task of segmenting the data into TCP datagrams, saving
cycles from the host CPU. Version 2 supports a maximum segment offload size of
256kb. As with IP Checksum Offload, this only applies when the Accelerator has the
TCP Offload disabled or the Microsoft stack has chosen not to offload a TCP connec-
tion to the Alacritech Accelerator. The default value is Enabled.
Large Send Offload Version 2 (IPv6) (10GbE Only)
Large Send Offload (LSO), also known as TCP Segmentation Offload (TSO), is a
“stateless” offload technology supported by the Alacritech Accelerator. When enabled,
the Accelerator performs the task of segmenting the data into TCP datagrams, saving
cycles from the host CPU. Version 2 supports a maximum segment offload size of
256kb. As with IP Checksum Offload, this only applies when the Accelerator has the
TCP Offload disabled or the Microsoft stack has chosen not to offload a TCP connec-
tion to the Alacritech Accelerator. The default value is Enabled.
Link Speed & Duplex (1GbE Only)
Normally, the link speed and duplex rate of the connection is determined through and
auto-negotiation process. In some cases, such as troubleshooting a poor connection,
the data transfer rate may be specified manually.
The default value is Auto Detect. The other setting values, based on the media (cop-
per or fiber interface), and their effects, are shown in the table below: