Jumbo Packet - StarTech.com STCST2000SPEXI Manual

When an event occurs, the adapter generates an interrupt,
which allows the driver to handle the packet. At greater
link speeds, more interrupts are created, and CPU rates also
increase. This results in poor system performance. When you
use a higher ITR setting, the interrupt rate is lower, and the
result is better system performance.
NOTE: A higher ITR rate also means the driver has more
latency in handling packets. If the adapter is handling many
small packets, lower the ITR so the driver is more responsive to
incoming and outgoing packets.

Jumbo Packet

Jumbo frames are Ethernet frames that are larger than 1518
bytes. You can use Jumbo Frames to reduce server CPU
utilization and increase throughput. However, additional
latency may be introduced.
NOTES:
• All equipment on the network must also support the larger
frame size. When
setting up Jumbo Frames on other network devices, be aware
that different network devices calculate Jumbo Frame size
differently. Some devices include the header information
in the frame size while others do not. Intel adapters do
not include header information in the frame size. When
configuring Jumbo Frames on a switch, set the frame size
four bytes higher for CRC, plus four bytes if you are using
VLANs or QoS packet tagging.
• Jumbo Frames are supported at 1000 Mbps only. Using
Jumbo Frames at 10 or 100 Mbps is not supported and may
result in poor performance or loss of link.
Instruction Manual
7