Guest speed artificially limited

[Urumiko]

Hi all. I have a host VM (Ubuntu), that is capping out at a transfer speed of 100mbps,
The guest nic is detected as 1gbps, and i even tried setting 
ethernet0.virtualDev = "vmxnet3"

to see if this made a difference, and while it is detected at 10gbps. the max throughput i can achieve is 100mbps.
The host machine is capable of much faster speeds.
I note the advice that throughput should be CPU limited but guest CPU is negligible, and host CPU is max 25% on any core.
Presumably id see 100% on at least 1 core if this were a CPU limit?

I also noticed that if I set a file transfer away sending from the guest to a file server at approx. 90 mbps then simultaneously run an internet speed test it will show 90 down/10 up. which really makes me feel like there is an artificial 100mbps limit somewhere.

Any ideas? 

[Technogeezer]

More details, please. There's no "artificial limitation" going on, but there's something else "throttling" your network speeds.

Workstation version?

Host operating system and version?

Host hardware?

Details on network configuration to whatever you're testing against.

Guest operating system version?

Bridged or NAT networking?

How are you measuring network speeds? What is the source of the transfer that's providing the measurement?

If you run the same (or similar) tests on your host, what's the speed you see there?

[Urumiko]

Workstation version? 17.5.0 build-22583795

Host operating system and version? Windows 10 Home 22H2

Host hardware? i7-7700HQ CPU @ 2.80GHz, 2801 Mhz, 4 Core(s), 8 Logical Processor(s)

32GB RAM

Details on network configuration to whatever you're testing against, Not sure what you want here but hopefully the below/Guest tests are enough.

Guest operating system version? Ubuntu 22.04.3 LTS

Bridged or NAT networking? NAT

How are you measuring network speeds? Several ways. The Host is connected via WIFI, and im primarily tring to copy files to an smb share on a bare metal install of truenas.

The in OS file copy indicator of the host was reading 8MBps, ive never seen it go higher than 13.

The in guest perfomance monitor, and the in host (task manager) all concur.

 

The host is connected at 800mbit

 

C:\Program Files (x86)\VMware>netsh wlan show interfaces

 

There is 1 interface on the system:

 

    Name                   : WiFi

    Description            : Killer Wireless-n/a/ac 1535 Wireless Network Adapter

    GUID                   : 06c9918d-0f30-484b-9626-e41de9c85d1c

    Physical address       : 9c:b6:d0:de:b9:c3

    State                  : connected

    SSID                   : Enofadov

    BSSID                  : a2:b5:3c:8f:2d:4f

    Network type           : Infrastructure

    Radio type             : 802.11ac

    Authentication         : WPA3-Personal

    Cipher                 : CCMP

    Connection mode        : Auto Connect

    Channel                : 64

    Receive rate (Mbps)    : 866.7

    Transmit rate (Mbps)   : 866.7

    Signal                 : 100%

    Profile                : Enofadov

 

If you run the same (or similar) tests on your host, what's the speed you see there?

 

I can copy to/from the same the freenas share at 400Mbit in both directions, and can speedtest to the internet at about the same.

[Michael Roy]

Not sure what's up here specifically, but I can definitely say we're not throttling anything (unless of course you're using Workstation Pro with the "bandwidth throttling" feature specifically...)

Attached screenshots taken with 1 Bridged and 1 NAT... the NAT ended up being faster as it happens, but they're both basically 1Gbps

I have a 14th gen i9 tho, so maybe in your case it's CPU bound.

It doesn't necessarily have to _peg_ the CPU for that IIRC.

 

[Urumiko]

Thanks for your efforts,
I take there's no significant CPU tax on NAT vs Bridged?
I don't think trying to bridge a WIFI connection worked when I tried.

[fname lnam]

I have been there some years ago, and I am pretty sure I found forum posts and/or articles that says VMware workstation is capped at 1 Gbps (that gives around 100-125 MiBps file transfer speeds (1Gbps divided by 8)).