Re: vtnet is still slow

Hi there, how does the topology looks?

This is from a 14.3 host  (bhyve) with a 14.3 guest.

Host is server, 14.3 is client 14.3

Best regards.

Santiago

iperf3 -c 192.168.1.1 -t 5 -P1 -Z
Connecting to host 192.168.1.1, port 5201
[  5] local 192.168.1.10 port 13866 connected to 192.168.1.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.01   sec   271 MBytes  2.25 Gbits/sec    0    739 KBytes
[  5]   1.01-2.01   sec   250 MBytes  2.09 Gbits/sec    0   1.44 MBytes
[  5]   2.01-3.01   sec   262 MBytes  2.21 Gbits/sec    0   1.60 MBytes
[  5]   3.01-4.01   sec   222 MBytes  1.86 Gbits/sec    0   1.60 MBytes
[  5]   4.01-5.01   sec   224 MBytes  1.89 Gbits/sec    0   1.60 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-5.01   sec  1.20 GBytes  2.06 Gbits/sec    0            sender
[  5]   0.00-5.01   sec  1.20 GBytes  2.06 Gbits/sec 
                  receiver

On 10/22/25 16:03, void wrote:
> Hi,
>
> I wondered if any work was happening to address the long-standing issue
> of slow vtnet? (in my case, this leads to slow freebsd guest performance
> in bhyve compared with every linux guest tested and OpenBSD).
>
> I thought maybe the recent bridge work may have ameliorated the 
> problem some, but testing, after configuring a (recent) stable/15 
> server to use the ip-configured-on-bridge-method, showed no 
> improvement using
> a (recent) stable/14 guest
>
> [ ID] Interval           Transfer     Bitrate         Retr
> [  5]   0.00-60.03  sec  3.17 GBytes   454 Mbits/sec    0 sender
> [  5]   0.00-60.03  sec  3.17 GBytes   454 Mbits/sec receiver
>
> for comparison, an ubuntu 25.04 guest:
>
> [ ID] Interval           Transfer     Bitrate         Retr
> [  5]   0.00-60.00  sec  6.42 GBytes   919 Mbits/sec  5427 sender
> [  5]   0.00-60.00  sec  6.42 GBytes   919 Mbits/sec receiver
>
> the baremetal host
>
> [ ID] Interval           Transfer     Bitrate         Retr
> [  5]   0.00-60.01  sec  6.58 GBytes   941 Mbits/sec    0 sender
> [  5]   0.00-60.01  sec  6.58 GBytes   941 Mbits/sec receiver
>
> Tests done a year and a half ago on similar hardware showing
> the same patterns http://void.f-m.fm.user.fm/bhyve-virtio-testing.html