[ignoramous]

Super neat.

Have these optimizations (TCP GRO/GSO) been applied to non-root tailscale? I imagine, the changes needed are wildly different as the TUN device itself is gvisor/netstack. I believe, the UDP GRO/GSO part (discussed in today's blog post) may work as-is.

[raggi]

Good question, it's bits and pieces. I know there's more we can do with the userspace stack - netstack has some support for GRO/GSO, but unless I'm forgetting a detail we haven't fully plumbed that yet. It would definitely be interesting to do so - avoiding TUN turnaround while still utilizing mmsg and so on should provide excellent performance for something like a tsnet/libtailscale based server. We did recently improve performance in that configuration by enabling SACK, which is very significant.