Hello,
I would like to ask you for help or advise.
I'm testing setup with higher number of XFRM interfaces and I'm facing
throughput degradation with a growing number of created XFRM interfaces - not
concurrent tunnels established but only XFRM interfaces created - even in DOWN
state.
Issue is only unidirectional - from "client" to "vpn hub". Throughput for
traffic from hub to client is not affected.
XFRM interface created with:
for i in {1..500}; do link add ipsec$i type xfrm dev ens224 if_id $i ; done
I'm testing with iperf3 with 1 client connected - from client to hub:
2 interfaces - 1.36 Gbps
100 interfaces - 1.35 Gbps
200 interfaces - 1.19 Gbps
300 interfaces - 0.98 Gbps
500 interfaces - 0.71 Gbps
Throughput from hub to client is around 1.4 Gbps in all cases.
1 CPU core is 100%
Linux v-hub 5.4.0-65-generic #73-Ubuntu SMP Mon Jan 18 17:25:17 UTC 2021 x86_64
x86_64 x86_64 GNU/Linux
Thank you.
Regards
Karel Vins
