netdev - High (200+) XFRM interface count performance problem (throughput)

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Date:   Tue, 23 Feb 2021 13:33:39 +0000
From:   Vinš Karel <karel.vins@...da.cz>
To:     "'netdev@...r.kernel.org'" <netdev@...r.kernel.org>
Subject: High (200+) XFRM interface count performance problem (throughput)

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