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emmericp / MoonGen

MoonGen is a fully scriptable high-speed packet generator built on DPDK and LuaJIT. It can saturate a 10 Gbit/s connection with 64 byte packets on a single CPU core while executing user-provided Lua scripts for each packet. Multi-core support allows for even higher rates. It also features precise and accurate timestamping and rate control.
MIT License
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How to configure the link speed for DPDK NIC? #298

Closed yyu4 closed 3 years ago

yyu4 commented 3 years ago

Hi,

I am using x540 NIC to test a 100Mbps network latency. Firstly I need to measure the x540 NIC self latency, i.e. to test the latency of back-to-back connection between two ports of x540. And the 100Mbps link speed is required. My question is how to configure x540 link speed, instead of auto-negotiation?

thanks, -Yi

vipinpv85 commented 3 years ago

can you share the following details like

  1. OS version
  2. Nic firmware
  3. driver being - igb_uio or vfio-pci or uio_pci_generic
  4. DPDK version
  5. shared or static library
  6. sample application in use (testpmd, skeleton, l2fwd) etc?

Reason for asking a sample DPDK application is because I assume you have already tried go into moon gen code search for ### rte_eth_dev_configure. Edit the last argument ### eth_conf to disable ### AUTONEG and enable ### FIXED with the required speed. Recompile and the test is failing for you.

yyu4 commented 3 years ago

Thank you @vipinpv85 . Your suggestion of "rte_eth_dev_configure" is the right answer for me. I was running "./build/MoonGen" bash with scripts like "l3-load-latency" etc. After configuring line 131 of MoonGen/libmoon/src/device.c to "./link_speeds = ETH_LINK_SPEED_100M," the NIC works at 100Mbps for me now. Best, -Yi