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User Manual, Rev 02
Rad-icon 2329 GigE Detector
Teledyne DALSA
GigE Vision framework for Sapera LT installation
The GigE Vision framework installs the GigE Vision Module for Sapera and includes
the Network Imaging package which is required to access a GigE Vision detector.
Refer to the “GigE Vision Module for Sapera” user manual and “Network Imaging
Module for Sapera LT” user manual which are included in the installation.
Optimizing Settings
The performance of the gigabit Ethernet connection on the host computer generally
can be improved by adjusting some settings in the NIC. The below advices refer to
the Intel Gigabit CT desktop adaptor. For a more detailed explanation please refer to
“Network Optimization Guide (PDF)” and “Network Imaging User’s Manual (PDF)”
which is part of the Sapera LT software package.
To reduce the interrupt overhead in the host the following settings in the NIC are
advised.
Packet Size
For a good Gigabit Ethernet connection with minimal packet resend conditions, host
computer performance can generally be improved by increasing the data packet size.
Each streaming video packet causes an interrupt in the host computer. Therefore
increasing the packet size reduces the CPU overhead required to handle video data
from the GigE Vision detectors.
A standard packet can have a size up to 1500 bytes. Many network cards support a
jumbo packet mode that can extend that size up to 16Kbytes. In theory, a packet could
be as large as 16 KB, but the CRC (cycle redundancy check) containing the checksum
of each packet is not as efficient when the packet size grows larger than 9000 bytes.
For this reason we advise to set the packet size to 9014 bytes (jumbo packet enabled).
Some system and network card configurations may have difficulty streaming and
handling jumbo packet data. If the system is having issues than it is advisable to
disable the Jumbo Packet setting, and use standard size packets of 1500 bytes for your
application.
