On Thu, 10 Oct 2024 09:45:36 +0200 Laurent Vivier <lvivier(a)redhat.com> wrote:On 10/10/2024 09:08, Stefano Brivio wrote:Ah, no, sorry, I meant slower than inbound traffic. For outbound traffic, I get very similar numbers between IPv4 and IPv6. And judging from perf output, it's all about copying and zeroing and stuff. As far as I know the kernel doesn't actually compute checksum, delivery is local. -- StefanoFor outbound traffic (I tried with IPv4), which is much slower for some reason (~25 Gbps):Perhaps because we can't bypass IPv4 header checksum whereas there is no IPv6 header checksum ?