就是一直给你努力的分析定位，最后回复 
  Upload loss is therefore localized before the server’s userspace UDP receive path. The capture still cannot distinguish an
  unrecorded qdisc/driver/filter discard from loss along the intervening network; it does not prove DMIT throttling.

  Download has a separate return-data service restriction, with queued data and frequent pacing stops. The retained timings do not
  yet ...