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Date:      Sat, 15 Apr 2023 18:59:33 +0000
From:      bugzilla-noreply@freebsd.org
To:        net@FreeBSD.org
Subject:   [Bug 268490] [igb] [lagg] [vlan]: Intel i210 performance severely degraded
Message-ID:  <bug-268490-7501-FFWA7hqd7v@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-268490-7501@https.bugs.freebsd.org/bugzilla/>
References:  <bug-268490-7501@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D268490

--- Comment #49 from Santiago Martinez <sm@codenetworks.net> ---
Hi Daniel,=20

from the config posted seems to be diff,but maybe i miss understood the fir=
st
msg.Anyhow the behavior that Marek is describing is not limited only to tho=
se
cards. You can increase the MTU on the phy or reduce the mtu on the logical=
.=20

I can see the same issue with IXL, BNXT and so on.

This is an output from my lab machines.
ixl2: flags=3D8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0=
 mtu
9000

ixl2.1011: flags=3D8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> met=
ric 0
mtu 9000
BR_DCN_PF: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mt=
u 9000

Connecting to host 192.168.11.42, port 5201
[  5] local 192.168.11.41 port 42631 connected to 192.168.11.42 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.01   sec  69.9 KBytes   568 Kbits/sec    2   8.73 KBytes=20=
=20=20=20=20=20=20
[  5]   1.01-2.04   sec  0.00 Bytes  0.00 bits/sec    2   8.73 KBytes=20=20=
=20=20=20=20=20
[  5]   2.04-3.04   sec  0.00 Bytes  0.00 bits/sec    1   8.73 KBytes=20=20=
=20=20=20=20=20
[  5]   3.04-4.00   sec  0.00 Bytes  0.00 bits/sec    0   8.73 KBytes=20=20=
=20=20=20=20=20
[  5]   4.00-5.05   sec  0.00 Bytes  0.00 bits/sec    0   8.73 KBytes=20=20=
=20=20=20=20=20
^C[  5]   5.05-5.82   sec  0.00 Bytes  0.00 bits/sec    1   8.73 KBytes=20=
=20=20=20=20=20=20
- - - - - - - - - - - - - - - - - - - - - - - - -

ifconfig ixl2.1011 mtu 8974
ifconfig BR_DCN_PF  mtu 8974
iperf3 -c 192.168.11.42

Connecting to host 192.168.11.42, port 5201
[  5] local 192.168.11.41 port 48630 connected to 192.168.11.42 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   120 MBytes  1.00 Gbits/sec    0   1.41 MBytes=20=
=20=20=20=20=20=20
[  5]   1.00-2.00   sec   118 MBytes   990 Mbits/sec    0   1.75 MBytes

--=20
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