Scott,
Are you getting that throughput between the VM and host machine? Or between
the VM and external network?



On Thu, May 17, 2018 at 10:27 AM Marcus D. Leech via USRP-users <
usrp-users@lists.ettus.com> wrote:

> On 05/17/2018 09:35 AM, Scott H via USRP-users wrote:
>
> Hello,
> I am currently trying to figure out why my N200 will only support data
> rates of 5 Msps inside a VM.
> System Details:
> Host: Ubuntu 16.04
>
> Guest: Centos7
> Processors: 8
> RAM: 16 GB
> Network: Bridged Adapter, virtio
>
> I have used iperf3 to test and verify my network speeds.  Speeds going
> into and out of the VM are both ~900 Mbps.  I have also tested the N200 on
> the host machine, and can achieve 20 Msps without any drops (not sure why I
> can't hit 25 Msps, but that is a different issue).  To test the USRP speeds
> I am using the built in UHD benchmark_rate example.
>
> benchmark_rate --rx_rate XXe6 --args "num_recv_frames=256"
>
> Any ideas as to why the VM would be killing the data rate?  I have had
> similar issues with USB USRPs, but my understanding was those took a big
> hit due to the virtualization of the actual USB hardware interface.  It
> seems that with a networked USRP, that as long as the network can handle
> the speeds (which supposedly it can using iperf3), then I shouldn't see any
> hit in the data rate.
>
> Thanks for your time and please let me know of any other outputs/commands
> you would like to see.
>
> -Scott
>
>
> Are you only allocating a single CPU core to the VM?  How much memory?
>
> Performance inside a VM will generally be somewhat less, or significantly
> less, than on the host machine.
>
>
>
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