How to minimize/eliminate dropped packets – ALLIED Vision Technologies AVT GigE Vision Cameras User Manual
Page 50
AVT GigE Cameras Installation Manual V1.0.1
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Troubleshooting
How to minimize/eliminate dropped packets?
•
Check the Gigabit Ethernet cable. A damaged cable often causes the host
to switch to 10/100 speed mode.
•
Use one of the NICs recommended in our hardware selection guide.
•
Use the latest NIC driver from the NIC manufacturer.
•
Enable jumbo frames/packets on NIC. Typical maximum supported packet
sizes are 9014 and 16000. Camera is set to packet size8228. Larger pack-
ets result in less overhead on the host CPU.
However, not all network hardware may support maximum packet size. For
example, if using a switch and seeing StatPacketsResent in the viewer,
decrease packet size until resends stop.
– VIMBA Viewer: decrease GevSCPSPacketSize
– GigE Sample Viewer: decrease PacketSize
This is an indication of buffer overflow on the switch. More frequently,
smaller sized packets resolve this.
•
Set NIC Interrupt Moderation Rate = Extreme. Receive Buffers = Max allow-
able.
•
Use PvAPI ≥ v1.26 with filter driver (filter is Windows only) ≥ v1.22
enabled on NIC.
•
Disable the firewall if no filter driver is used.
•
Use a dedicated LAN/NIC/Switch for the camera(s). Do not share camera
networks with internet, company LAN, etc. If using multiple cameras on a
single port NIC through a switch, be sure the sum of StreamBytesPerSecond
on all cameras doesn't exceed available bandwidth (124,000,000 MBps).
•
GX Only: With LAG, you may need to increase GvspLookbackWindow/
GVSPMaxLookBack.
www
A list of AVT recommended Ethernet adapters is available
on the AVT website.
www
To download latest PvAPI SDK, visit:
www
For more information on GvspLookbackWindow/
GVSPMaxLookBack, see:
PvAPI users:
VIMBA users