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

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Message-Id: <71C2308A-0E9C-4AD3-837A-03CE8EA4CA1D@bejarano.io>
Date: Thu, 29 May 2025 14:45:34 +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

> It's interesting, however, that the number of TCP packets is exactly twice
> that of the number of non-linear sk_buffs we saw in tbnet_start_xmit. Not that
> it's suspicious, if anything (and because we see those TCP packets in blue) it
> tells us that the handling of non-linear skbs is not the problem in
> tbnet_start_xmit.
> But why twice? Or is this a red herring?

I've confirmed that all UDP skb's we transmit are linear.
All non-linear skb's are TCP.