L2TP performance

[tj-19]

Hi all,

I was just wondering if anyone is using ACCEL with L2TP and 1 Gbps connections.

I have a test server running using a 40 Gbps - XL710-QDA1 NIC.

The CPU usage is very low and I am using 8 cores.

But the throughput is only around 300 Mbps.

I've tried setting NIC optimisation, such as ethtool -K enp1s0 gso off gro off tso off

Is there any support for DDP (Dynamic Device Personalization) ?

Any ideas?

[dimka88]

Hi @tj-19, I think in this case it will related to CPU frequency. Try to disable HT, set CPU policy (scaling governor) to performance. Also try to disable mitigations, like meltdown and spectre 1 and 2

[tj-19]

Hi,

The CPU is a Xeon E5-2440 which runs at 2.40 GHz.

I disabled Hyperthreading, set the SG and disabled the suggested mitigations.

In all cases the overall CPU is very low.

What is the relation between the frequency and performance in this case?

Many thanks for your help.

[dimka88]

Hi @tj-19, CPU frequency related to flow speed. Did you try to test speed with speedtest multiflow mode?
Could you show `top` command output and press `1` when you doing test?