topic P1022 eTSEC speed test issue in P-Series

P1022 eTSEC speed test issue

wangruolong1 — Wed, 01 Jun 2016 02:27:47 GMT

I use iperf3 to test P1022 eTSEC Speed. if just test only one eTSEC, use UDP protocol, the speed will be over 900Mbps.

but, if the two eTSEC tested at the same time, use UDP protocol, one eTSEC speed is 600Mbps, and the other eTSEC speed is 400Mbps

So, I want to know how can i optimize the system in order to improve the two eTSEC performance

Or, can you tell me the performance that the two eTSEC be used at the same time?

Re: P1022 eTSEC speed test issue

bpe — Wed, 01 Jun 2016 14:46:33 GMT

iperf3, according to the first sentence on it's home page, is a tool

to measure the bandwidth of a _network_ , not a network node (host).

https://iperf.fr/

Since iperf utilized L4 protocols, which require significant

processing in software, the result depends on the

core and platform speed as well as on the memory bandwidth. If you

run several instantiations of such tests, it is normal that the observed

performance degrades, although both eTSECs operate fully independently.

Some steps that may improve the result include:

1. Affine eTSEC interrupts to CPUs

2. Affine the test tasks to CPUs

3. Disable PTP support

4. Play with interrupt coalescing and Rx/Tx buffer ring sizes.

These parameters are controlled by ethtool

We do not use iperf for benchmarking. There is a simiar test (with similar

limitations), netperf, for which we have a brief reproducibility guide:

https://freescale.sdlproducts.com/LiveContent/content/en-US/QorIQ_SDK/GUID-78005E19-F68E-4169-9828-952BAD67A1B0

As of the performance you can expect, benchmarking information requires

NDA and cannot be posted here. Please contact your distributor for

practically obtained performance figures.

Have a great day,
Platon

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Re: P1022 eTSEC speed test issue

wangruolong1 — Tue, 07 Jun 2016 06:17:02 GMT

firstly, thank you for your reply!!

here is my ethtool print information, i can not get the method to modify the Rx/Tx buffer and cannot play with interrupt coalescing. You can see that all of the buffer size is 256,how can i improve it? So，do you have some suggestion or some paper for config rx/tx buffer issues?

root@p1022ds:~# ethtool -g eth0

Ring parameters for eth0:

Pre-set maximums:

RX: 256

RX Mini: 256

RX Jumbo: 256

TX: 256

Current hardware settings:

RX: 256

RX Mini: 256

RX Jumbo: 256

TX: 256