[Bug 233949] [if_rtwn] rwtn packet loss 10-25%

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233949

            Bug ID: 233949
           Summary: [if_rtwn] rwtn packet loss 10-25%
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: wireless at FreeBSD.org
          Reporter: mr_beaner_2003 at yahoo.com

RE: 218527, is not fixed. I am testing with an EDIMAX N150 Nano USB Adapter.

# freebsd-version
13.0-CURRENT

# usbconfig -d ugen1.2 dump_all_desc 
ugen1.2: <Realtek 802.11n WLAN Adapter> at usbus1, cfg=0 md=HOST spd=HIGH
(480Mbps) pwr=ON (500mA)

  bLength = 0x0012 
  bDescriptorType = 0x0001 
  bcdUSB = 0x0200 
  bDeviceClass = 0x0000  <Probed by interface class>
  bDeviceSubClass = 0x0000 
  bDeviceProtocol = 0x0000 
  bMaxPacketSize0 = 0x0040 
  idVendor = 0x7392 
  idProduct = 0x7811 
  bcdDevice = 0x0200 
  iManufacturer = 0x0001  <Realtek>
  iProduct = 0x0002  <802.11n WLAN Adapter>
  iSerialNumber = 0x0003  <00e04c000001>
  bNumConfigurations = 0x0001 

 Configuration index 0

    bLength = 0x0009 
    bDescriptorType = 0x0002 
    wTotalLength = 0x002e 
    bNumInterfaces = 0x0001 
    bConfigurationValue = 0x0001 
    iConfiguration = 0x0000  <no string>
    bmAttributes = 0x00a0 
    bMaxPower = 0x00fa 

    Interface 0
      bLength = 0x0009 
      bDescriptorType = 0x0004 
      bInterfaceNumber = 0x0000 
      bAlternateSetting = 0x0000 
      bNumEndpoints = 0x0004 
      bInterfaceClass = 0x00ff  <Vendor specific>
      bInterfaceSubClass = 0x00ff 
      bInterfaceProtocol = 0x00ff 
      iInterface = 0x0000  <no string>

     Endpoint 0
        bLength = 0x0007 
        bDescriptorType = 0x0005 
        bEndpointAddress = 0x0081  <IN>
        bmAttributes = 0x0002  <BULK>
        wMaxPacketSize = 0x0200 
        bInterval = 0x0000 
        bRefresh = 0x0000 
        bSynchAddress = 0x0000 

     Endpoint 1
        bLength = 0x0007 
        bDescriptorType = 0x0005 
        bEndpointAddress = 0x0002  <OUT>
        bmAttributes = 0x0002  <BULK>
        wMaxPacketSize = 0x0200 
        bInterval = 0x0000 
        bRefresh = 0x0000 
        bSynchAddress = 0x0000 

     Endpoint 2
        bLength = 0x0007 
        bDescriptorType = 0x0005 
        bEndpointAddress = 0x0003  <OUT>
        bmAttributes = 0x0002  <BULK>
        wMaxPacketSize = 0x0200 
        bInterval = 0x0000 
        bRefresh = 0x0000 
        bSynchAddress = 0x0000 

     Endpoint 3
        bLength = 0x0007 
        bDescriptorType = 0x0005 
        bEndpointAddress = 0x0084  <IN>
        bmAttributes = 0x0003  <INTERRUPT>
        wMaxPacketSize = 0x0040 
        bInterval = 0x0001 
        bRefresh = 0x0000 
        bSynchAddress = 0x0000 

# ifconfig wlan0
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 74:da:38:d5:f5:4b
        inet 172.30.8.76 netmask 0xffffffc0 broadcast 172.30.8.127 
        groups: wlan 
        ssid WAPNAME channel 11 (2462 MHz 11g ht/20) bssid 80:2a:a8:d7:ec:a5
        regdomain FCC country US authmode WPA2/802.11i privacy ON
        deftxkey UNDEF AES-CCM 2:128-bit txpower 30 bmiss 7 scanvalid 60
        protmode CTS ht20 ampdulimit 64k ampdudensity 8 shortgi -stbc -ldpc
        wme roaming MANUAL
        media: IEEE 802.11 Wireless Ethernet MCS mode 11ng
        status: associated
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

# ping -c 100 172.30.8.65
PING 172.30.8.65 (172.30.8.65): 56 data bytes
64 bytes from 172.30.8.65: icmp_seq=0 ttl=255 time=16.389 ms
...
64 bytes from 172.30.8.65: icmp_seq=59 ttl=255 time=1316.844 ms
64 bytes from 172.30.8.65: icmp_seq=61 ttl=255 time=121.498 ms
64 bytes from 172.30.8.65: icmp_seq=62 ttl=255 time=44.221 ms
64 bytes from 172.30.8.65: icmp_seq=63 ttl=255 time=59.534 ms
64 bytes from 172.30.8.65: icmp_seq=64 ttl=255 time=66.640 ms
64 bytes from 172.30.8.65: icmp_seq=65 ttl=255 time=39.747 ms
64 bytes from 172.30.8.65: icmp_seq=66 ttl=255 time=57.837 ms
64 bytes from 172.30.8.65: icmp_seq=67 ttl=255 time=104.932 ms
...

--- 172.30.8.65 ping statistics ---
100 packets transmitted, 75 packets received, 25.0% packet loss
round-trip min/avg/max/stddev = 12.461/58.785/1316.844/147.781 ms

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