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  • [6.9.2] Adding VMs to br0 slows performance using AQC107 10Gbe ethernet


    DuckBrained
    • Minor

    My configuration: I have a Mac laptop with a 10Gbe hub. I have an UnRAID server with 10Gbe NIC, an AQC107 chipset model built into the motherboard.

     

    I have eth0 configured with br0 for VMs.

     

    When I run iperf3 between the Mac and the server, I get full speeds 10Gbps as expected.

     

    However, as I boot each virtual machine that's assigned to br0, the iperf3 performance drops by approximately 1Gbps per VM booted. I also see CPU usage spikes on cores that are isolated and shouldn't be usable by UnRAID itself.

     

    Full diagnostic process available in this thread.




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    Recommended Comments

    bonienl

    Posted

    Each VM takes resources away, especially CPU resources, which impacts single stream performance.

    You need to test with multiple streams to see the true limitation of your network.

     

    I am using the AQC107 chipset too (Asus NIC) and have 5 VMs running:

     

    Test 1: PC to server (4 streams)

    C:\Tools\iperf>iperf3 -c 10.0.101.11 -i0 -P4
    Connecting to host 10.0.101.11, port 5201
    ..
    ..
    [SUM]   0.00-10.00  sec  11.0 GBytes  9.49 Gbits/sec                  sender
    [SUM]   0.00-10.00  sec  11.0 GBytes  9.49 Gbits/sec                  receiver

     

    Test 2: Server to PC (4 streams)

    C:\Tools\iperf>iperf3 -c 10.0.101.11 -i0 -P4 -R
    Connecting to host 10.0.101.11, port 5201
    Reverse mode, remote host 10.0.101.11 is sending
    ..
    ..
    [SUM]   0.00-10.00  sec  10.9 GBytes  9.38 Gbits/sec    0             sender
    [SUM]   0.00-10.00  sec  10.9 GBytes  9.37 Gbits/sec                  receiver

     

     

    DuckBrained

    Posted

    Thanks, I've done some testing including real world and I seem to be getting transfers as expected.

     

    I also reset my network switch which seemed to help.



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