[VBox] Extreme slow UDP performance between host and guest

[Eric Joyner]

Did you use the "-b" option to set the bandwidth it uses for UDP? It
defaults to 1Mb/s, which is close to what you're seeing.

Plus, I think the recommendation is that you use iperf3, anyway, and I
don't think it has this quirk.

On Thu, Sep 1, 2016 at 2:06 AM Howard Su <howard0su at gmail.com> wrote:

> I used iperf to do a quick experiment on the UDP performance between
> VirtualBox and Guest through vboxnetadp. Guest is acting as server and Host
> machine is acting as client. the UDP throughput is only 1/350 of TCP
> throughput.
>
> Guest kernel is -Current and Host Kernel is 11.0-RC2. Anyone has idea? is
> there any known issue in vboxnetadp?
>
> ------------------------------------------------------------
> Client connecting to 192.168.0.60, UDP port 5001
> Sending 1470 byte datagrams
> UDP buffer size: 9.00 KByte (default)
> ------------------------------------------------------------
> [  3] local 192.168.0.1 port 48290 connected with 192.168.0.60 port 5001
> [ ID] Interval       Transfer     Bandwidth
> [  3]  0.0-10.0 sec  1.25 MBytes  1.05 Mbits/sec
> [  3] Sent 893 datagrams
> [  3] Server Report:
> [  3]  0.0-10.0 sec  1.25 MBytes  1.05 Mbits/sec   0.039 ms    0/  893 (0%)
>
> ------------------------------------------------------------
> Client connecting to 192.168.0.60, UDP port 5001
> Sending 4096 byte datagrams
> UDP buffer size: 9.00 KByte (default)
> ------------------------------------------------------------
> [  3] local 192.168.0.1 port 58009 connected with 192.168.0.60 port 5001
> [ ID] Interval       Transfer     Bandwidth
> [  3]  0.0-10.0 sec  1.25 MBytes  1.05 Mbits/sec
> [  3] Sent 321 datagrams
> [  3] Server Report:
> [  3]  0.0-10.0 sec  1.25 MBytes  1.05 Mbits/sec   0.100 ms    0/  321 (0%)
>
> ------------------------------------------------------------
> Client connecting to 192.168.0.60, TCP port 5001
> TCP window size: 32.8 KByte (default)
> ------------------------------------------------------------
> [  3] local 192.168.0.1 port 15490 connected with 192.168.0.60 port 5001
> [ ID] Interval       Transfer     Bandwidth
> [  3]  0.0-10.0 sec   447 MBytes   374 Mbits/sec
>
>
> -Howard
>
> --
> -Howard
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