Installation guide

Alacritech Accelerator Users Guide: Microsoft Windows Edition 3-15
Flow Control (10GbE Only)
Flow control through the use of pause frames can reduce congestion and the loss of
data. To work properly, flow control must be enabled on the Accelerator, the switch,
and all other devices in the data path. The default value is Enabled.
Note: The use of flow control in 10GbE LAN and iSCSI SANs is highly recom-
mended.
Framing (10GbE Only)
Framing allows for the efficient processing of small blocks of data, improving through-
put and efficiency. The default value is Enabled.
Interrupt Moderation (10GbE Only)
Interrupt Moderation improves server efficiency by reducing the number of interrupts
the Alacritech Accelerator sends to the host CPU. Increasing the time between inter-
rupts reduces CPU utilization, but can increase latency, depending on the amount of
time the Accelerator stays idle compared to moving data. By adjusting the Idle and
Max time values, you can fine-tune the performance of the Alacritech Accelerator. The
default value is Enabled.
Interrupt Moderation Idle time (10GbE Only)
The Idle time is the maximum amount of time the Accelerator can stay idle (not moving
data) without generating an interrupt. The Idle time should be set to value lower than
the Max time. The default value is 16 microseconds. The maximum value is 64.
Interrupt Moderation Max time (10GbE Only)
The Max time is the total maximum time between interrupts, regardless of whether or
not the Accelerator is idle. The Max time should be set to a value higher than the Idle
time. The default value is 64 microseconds. The maximum value is 256.
IPv4 Checksum Offload
The IP Checksum Offload option allows the Accelerator to offload the IP checksum
calculations for transmitted and received IP data. This only applies when the Accelera-
tor has the TCP Offload disabled or the Microsoft stack has chosen not to offload a
TCP connection to the Alacritech Accelerator. An example of this would be the used of
IPSec which cannot be offloaded to the Alacritech Accelerator. The default value is
Enabled.