Date: Wed, 22 Oct 2025 16:35:15 +0200 From: Santiago Martinez <sm@codenetworks.net> To: freebsd-net@freebsd.org Subject: Re: vtnet is still slow Message-ID: <649d06b9-17d7-4d67-a2d0-bb53c76b62fe@codenetworks.net> In-Reply-To: <aPjkGDgl6MCF-unb@int21h> References: <aPjkGDgl6MCF-unb@int21h>
next in thread | previous in thread | raw e-mail | index | archive | help
[-- Attachment #1 --]
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
[-- Attachment #2 --]
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Hi there, how does the topology looks?</p>
<p>This is from a 14.3 host (bhyve) with a 14.3 guest.</p>
<p>Host is server, 14.3 is client 14.3</p>
<p>Best regards.</p>
<p>Santiago</p>
<p><span style="font-family:monospace"><span
style="color:#000000;background-color:#ffffff;">iperf3 -c
192.168.1.1 -t 5 -P1 -Z</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">Connecting
to host 192.168.1.1, port 5201</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">[ 5]
local 192.168.1.10 port 13866 connected to 192.168.1.1 port
5201</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">[ ID]
Interval Transfer Bitrate Retr Cwnd</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">[ 5]
0.00-1.01 sec 271 MBytes 2.25 Gbits/sec 0 739
KBytes </span><span
style="color:#000000;background-color:#ffffff;"> </span><br>
<span style="color:#000000;background-color:#ffffff;">[ 5]
1.01-2.01 sec 250 MBytes 2.09 Gbits/sec 0 1.44
MBytes </span><span
style="color:#000000;background-color:#ffffff;"> </span><br>
<span style="color:#000000;background-color:#ffffff;">[ 5]
2.01-3.01 sec 262 MBytes 2.21 Gbits/sec 0 1.60
MBytes </span><span
style="color:#000000;background-color:#ffffff;"> </span><br>
<span style="color:#000000;background-color:#ffffff;">[ 5]
3.01-4.01 sec 222 MBytes 1.86 Gbits/sec 0 1.60
MBytes </span><span
style="color:#000000;background-color:#ffffff;"> </span><br>
<span style="color:#000000;background-color:#ffffff;">[ 5]
4.01-5.01 sec 224 MBytes 1.89 Gbits/sec 0 1.60
MBytes </span><span
style="color:#000000;background-color:#ffffff;"> </span><br>
<span style="color:#000000;background-color:#ffffff;">- - - - -
- - - - - - - - - - - - - - - - - - - -</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">[ ID]
Interval Transfer Bitrate Retr</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">[ 5]
0.00-5.01 sec 1.20 GBytes 2.06 Gbits/sec 0
sender</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">[ 5]
0.00-5.01 sec 1.20 GBytes 2.06 Gbits/sec
receiver</span><br>
</span><br>
</p>
<div class="moz-cite-prefix">On 10/22/25 16:03, void wrote:<br>
</div>
<blockquote type="cite" cite="mid:aPjkGDgl6MCF-unb@int21h">Hi,
<br>
<br>
I wondered if any work was happening to address the long-standing
issue
<br>
of slow vtnet? (in my case, this leads to slow freebsd guest
performance
<br>
in bhyve compared with every linux guest tested and OpenBSD).
<br>
<br>
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
<br>
a (recent) stable/14 guest
<br>
<br>
[ ID] Interval Transfer Bitrate Retr
<br>
[ 5] 0.00-60.03 sec 3.17 GBytes 454 Mbits/sec 0
sender
<br>
[ 5] 0.00-60.03 sec 3.17 GBytes 454 Mbits/sec
receiver
<br>
<br>
for comparison, an ubuntu 25.04 guest:
<br>
<br>
[ ID] Interval Transfer Bitrate Retr
<br>
[ 5] 0.00-60.00 sec 6.42 GBytes 919 Mbits/sec 5427
sender
<br>
[ 5] 0.00-60.00 sec 6.42 GBytes 919 Mbits/sec
receiver
<br>
<br>
the baremetal host
<br>
<br>
[ ID] Interval Transfer Bitrate Retr
<br>
[ 5] 0.00-60.01 sec 6.58 GBytes 941 Mbits/sec 0
sender
<br>
[ 5] 0.00-60.01 sec 6.58 GBytes 941 Mbits/sec
receiver
<br>
<br>
Tests done a year and a half ago on similar hardware showing
<br>
the same patterns
<a class="moz-txt-link-freetext" href="http://void.f-m.fm.user.fm/bhyve-virtio-testing.html">http://void.f-m.fm.user.fm/bhyve-virtio-testing.html</a>;
<br>
</blockquote>
</body>
</html>
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?649d06b9-17d7-4d67-a2d0-bb53c76b62fe>