netdev - Re: Poor thunderbolt-net interface performance when bridged

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Message-Id: <88E7B346-18BE-4149-BFD7-8DB5B48ED52E@bejarano.io>
Date: Mon, 26 May 2025 21:36:37 +0200
From: Ricard Bejarano <ricard@...arano.io>
To: Stephen Hemminger <stephen@...workplumber.org>
Cc: Andrew Lunn <andrew@...n.ch>,
 Mika Westerberg <mika.westerberg@...ux.intel.com>,
 netdev@...r.kernel.org,
 michael.jamet@...el.com,
 YehezkelShB@...il.com,
 andrew+netdev@...n.ch,
 davem@...emloft.net,
 edumazet@...gle.com,
 kuba@...nel.org,
 pabeni@...hat.com
Subject: Re: Poor thunderbolt-net interface performance when bridged

Hi Stephen, thank you too for chiming in.

> What is MTU?

MTU is 1500 across the board.

root@red:~# ip a
...
2: eno1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 94:c6:91:a3:f5:1a brd ff:ff:ff:ff:ff:ff
    altname enp0s31f6
6: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether ce:42:52:00:a0:5b brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.1/24 brd 10.0.0.255 scope global br0
       valid_lft forever preferred_lft forever
8: tb0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP group default qlen 1000
    link/ether 02:5f:d6:57:71:93 brd ff:ff:ff:ff:ff:ff
root@red:~#

root@...e:~# ip a 
...
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP group default qlen 1000
    link/ether 1c:69:7a:00:22:99 brd ff:ff:ff:ff:ff:ff
    altname enp0s31f6
5: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 3a:4d:83:e0:ab:3b brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.2/24 brd 10.0.0.255 scope global br0
       valid_lft forever preferred_lft forever
6: tb0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP group default qlen 1000
    link/ether 02:70:19:dc:92:96 brd ff:ff:ff:ff:ff:ff
root@...e:~#

root@...ple:~# ip a
...
2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP group default qlen 1000
    link/ether 1c:69:7a:60:d8:69 brd ff:ff:ff:ff:ff:ff
    altname enp0s31f6
4: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 1a:45:1d:c0:46:02 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.3/24 brd 10.0.0.255 scope global br0
       valid_lft forever preferred_lft forever
root@...ple:~#