On Wed, Sep 24, 2025 at 03:33:08PM +0800, Jason Wang wrote: > On Wed, Sep 24, 2025 at 3:18 PM Michael S. Tsirkin <[email protected]> wrote: > > > > On Tue, Sep 23, 2025 at 12:15:45AM +0200, Simon Schippers wrote: > > > This patch series deals with TUN, TAP and vhost_net which drop incoming > > > SKBs whenever their internal ptr_ring buffer is full. Instead, with this > > > patch series, the associated netdev queue is stopped before this happens. > > > This allows the connected qdisc to function correctly as reported by [1] > > > and improves application-layer performance, see our paper [2]. Meanwhile > > > the theoretical performance differs only slightly: > > > > > > About this whole approach. > > What if userspace is not consuming packets? > > Won't the watchdog warnings appear? > > Is it safe to allow userspace to block a tx queue > > indefinitely? > > I think it's safe as it's a userspace device, there's no way to > guarantee the userspace can process the packet in time (so no watchdog > for TUN). > > Thanks
Hmm. Anyway, I guess if we ever want to enable timeout for tun, we can worry about it then. Does not need to block this patchset. > > > > -- > > MST > >
