Linux kernel packet loss - Help needed!

[Vrolijk]

As described in https://github.com/Vrolijk/OSDD/blob/main/packetloss_explained.md Linux does drop UDP packets. There are several ways to optimize UDP traffic like Forward Error Control (FEC) within the application, optimizing the UDP network buffers but even with these optimizations UDP remains unreliable.

During the creation of the workshop we collected some idea's but where not able to add them to the workshop.
Use eXpress Data Path XDP: https://github.com/Vrolijk/OSDD/blob/main/examples/XDP_to_prevent_packet_loss.md
Modify udp.c within the kernel with function when using data diodes: https://github.com/torvalds/linux/blob/master/net/ipv4/udp.c
Create an FEC application: https://github.com/Vrolijk/OSDD/blob/main/netcat-diode.md

If you have more suggestions or know how to implement these suggestions (if they are viable) please leave a comment.

Regards,
Rene

[Vrolijk]

XDP Example: https://github.com/gamemann/XDP-Forwarding
Not tested.

Question: how can we use the XDP_TX route at the bottom?

[Vrolijk]

Use Flute protocol: https://github.com/ypo/flute
Not tested.

[poweredgenl]

hey - im unsure wether this helps - but i have made some mods to my linux (routers) to optimize for max traffic throughput ...

could one of these settings perhaps help you?

https://github.com/poweredgenl/networkstuff/blob/main/sysctl.conf_bgp_RHEL9

[Vrolijk]

tried the sctp protocol without success...

[Vrolijk]

hey - im unsure wether this helps - but i have made some mods to my linux (routers) to optimize for max traffic throughput ...

could one of these settings perhaps help you?

https://github.com/poweredgenl/networkstuff/blob/main/sysctl.conf_bgp_RHEL9

Peter Paul,
Thank you for the suggestion. The sysctl optimization is already part of the workshop. It does improve the packetloss but when i send large files or streams the networkbuffers still drops packets (as designed in the UDP protocol)

[Vrolijk]

Some tips https://stackoverflow.com/questions/7968566/what-would-cause-udp-packets-to-be-dropped-when-being-sent-to-localhost