On 11/26/25 08:15, Michael S. Tsirkin wrote: > On Fri, Nov 21, 2025 at 10:22:54AM +0100, Simon Schippers wrote: >> I agree, but I really would like to reduce the buffer bloat caused by the >> default 500 TUN / 1000 TAP packet queue without losing performance. > > that default is part of the userspace API and can't be changed. > just change whatever userspace is creating your device. >
Yes, but I’m thinking about introducing a new interface flag like IFF_BQL. However, as noted earlier, there are significant implementation challenges. I think there can be advantages to something like VPN's on mobile devices where the throughput varies between a few Mbit/s (small TUN/TAP queue is fine) and multiple Gbit/s (need a bigger queue).
