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

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Message-Id: <A206060D-C73B-49B9-9969-45BF15A500A1@bejarano.io>
Date: Wed, 28 May 2025 15:08:14 +0200
From: Ricard Bejarano <ricard@...arano.io>
To: Andrew Lunn <andrew@...n.ch>
Cc: 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

> That is something else. The slightly larger than 1000ms, means ping #2
> is kicking ping #1 onto the wire. The transmit is not starting for
> some reason until the next packet is queued for transmission.

You were right once again, sir.

I've not been able to replicate the 1000ms delays after starting from a clean
6.14.8 install. Ping is fast again.

However, there's still a performance problem.

The iperf3 client (red) hangs forever.

The server (blue) throws this error:
iperf3: error - unable to receive cookie at server:

And red's dmesg shows:
[  399.534149] workqueue: output_poll_execute hogged CPU for >10000us 19 times, consider switching to WQ_UNBOUND
[  399.572109] workqueue: i915_hpd_poll_init_work [i915] hogged CPU for >10000us 19 times, consider switching to WQ_UNBOUND

Anything else I might be missing?

RB