On 16/12/2020 08:45, Jesper Dangaard Brouer wrote: > So, what I hear is that this fix is just pampering over the real issue. Yes, it is, but it's better than nothing in the meantime while we work out the complete fix. > I suggest that you/we detect the situation, and have a code path that > will take a lock (per 16 packets bulk) and solve the issue. Imho that would _also_ paper over the issue, because it would mean the system degraded to a lower performance mode of operation, while still appearing to support XDP_TX. I think that that in general should not happen unless there is a way for the user to determine at runtime whether it has/should happen. Perhaps Marek's new XDP feature flags could include a "tx-lockless" flag to indicate this? -ed
