Re: Slow VMXNET3 performance on 10gig connection

Generally agree but:

1. yes, 1 vCPU for tested vm each for overhead as the cause of the problem and check ESX Host CPU utilization – ok,

     but for fine tuning, not for results 5-10 times lower than expected.

2. jumbo frames – ok, but my tests show that even without jumbo frames (sorry, now only on 1Gb interface)

    we can get transfers like 900Mb/s

3. yes, agree, I use iperf only with TCP

4. we can use iperf options for dual/trade communication tests ( -d –L 5001  or  -d –r –L 5001 ).

    In my tests I use only one way transfers and change parameters only on clieny side.

Best Regards,

Janusz