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You can get within a few percentage points, yes

I just tested this with two hosts with 4.14.127 upstream kernel and upstream mlx5 driver, and mellanox connectx-5 card. Using 16 iperf threads

[SUM] 0.0-10.0 sec 85.1 Gbits/sec

That's pretty close with no tuning, and well beyond 10gb/s we mentioned earlier

discuss

GhettoMaestro|6 years ago

Wrong. You’re like an order of magnitude wrong - rofl there is no fucking way the stock Linux kernel will even do 40Mpps at 64 byte packets. It chokes way before that. This is partly why things like DPDK exist.

ra1n85|6 years ago

16 iperf threads...sending at what packet size? Do you understand the notion of line rate? 85Gbps at 1500B is only 7MPPS, which is half of 10Gbps at line rate.

Dylan16807|6 years ago

Where are you getting your definitions? I have never seen "line rate" used to refer to packets per second.

toast0|6 years ago

Does line rate imply smallest packets? For CDN style use cases, you want to use the whole pipe, and it's going to be mostly larger packets.

gonzo|6 years ago

You’re sending 1500 byte MTU (1538 bytes on the wire) or maybe larger (9000 byte MTU) packets.

1538 bytes is 12,304 bits. 10,000,000,000 bits/sec / 12,304 bits/packet is 812,744 packets per second.

Now try it with 64 byte packets, which are 84 bytes on the wire.

14,880,952 packets per second.

And this is 10gbps.