Re: [PATCH] swiotlb: avoid double copy with swiotlb on tx socket

[Jakub Kicinski]

On Mon, 15 Jun 2026 23:42:20 +0000 Luigi Rizzo wrote:
> The use of swiotlb causes an extra data copy on I/O.  For tx sockets,
> especially with greedy senders, this has a high chance of happening in
> the softirq handler for tx network interrupts, creating a significant
> performance bottleneck.

What's the use case? I associate swiotlb with debug / testing mostly,
so it'd be useful for people like me to explain why you care.

BTW net-next is closed: https://netdev.bots.linux.dev/net-next.html