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

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Message-Id: <AB7F8F0D-7D56-4CF9-BCE9-690A61EDED74@bejarano.io>
Date: Tue, 27 May 2025 21:17:47 +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

> So, another idea, just to see if skb with frags are an
> issue. Somewhere need the beginning of tbnet_start_xmit() add:
> 
>   if (skb_is_nonlinear(skb))
>     skb = skb_linearize(skb);
> 
> That should convert an skb with fragments to a skb without
> fragments. It will be bad for performance, so if it does work it is
> not a fix, but it will confirm we are in the right area.

That would be on the tx side, right? On red, not blue.

RB