Ping times?

Hammy · Mon May 15, 2006 7:41 pm

I have posted some ping results below. The times seem a bit goofy. None of the devices are over a 30 - 40% load. Links are barely used if at all. All wireless links are 5 GHz N-Streme.

--- 10.1.5.1 ping statistics ---
300 packets transmitted, 300 received, 0% packet loss, time 299248ms
rtt min/avg/max/mdev = 1.265/1.564/2.841/0.308 ms, pipe 2

This is going through a pair of switches to a 532. Not a horrible ping time.

--- 10.10.1.1 ping statistics ---
300 packets transmitted, 300 received, 0% packet loss, time 299241ms
rtt min/avg/max/mdev = 2.874/19.303/117.095/18.132 ms, pipe 2

This is going through the above router to an Athlon based AP with signal strengths between -75 and -80. Noise floor is -100 to -105. Minimum ping is what I expected. The average and maximum are way above what I expected.

300 packets transmitted, 300 packets received, 0% packet loss
round-trip min/avg/max = 4/23.5/111 ms

This is the same link as above, but from the 532 instead of through it.

300 packets transmitted, 300 packets received, 0% packet loss
round-trip min/avg/max = 2/7.4/45 ms

This is going from a 512 to the Athlon AP. Signal is from -57 to -63 with a noise floor of -105 to -110. The min seems alright, but the average and max seem high.

Hammy · Wed May 31, 2006 9:09 pm

Test conducted while there were two 1500 byte pings going to or through the router.

532 to Athlon AP
==========

Without pings (repost of previous data)
-----
300 packets transmitted, 300 packets received, 0% packet loss
round-trip min/avg/max = 4/23.5/111 ms

With pings
-----
300 packets transmitted, 300 packets received, 0% packet loss
round-trip min/avg/max = 4/19.0/124 ms

512 to Athlon AP (different sector)
==========

Without pings (repost of previous data)
-----
300 packets transmitted, 300 packets received, 0% packet loss
round-trip min/avg/max = 2/7.4/45 ms

With pings
-----
300 packets transmitted, 300 packets received, 0% packet loss
round-trip min/avg/max = 2/8.9/43 ms

So not much of a difference. Any other ideas?

jonbrewer · Tue Jun 06, 2006 12:06 am

Those pings look typical. You are sharing 5GHz spectrum with heaps of other devices that interfere. When you have RF interference and loss on these Mikrotik/Atheros units, data retransmits at layer 1, and the loss shows up as jitter.

Hammy · Tue Jun 06, 2006 6:32 am

MT doesn't report the noise floor higher than -100, meaning a signal to noise of 20 db. I'd expect this to be enough above the noise function to work without the jitter. How can I see if layer 1 retransmissions are what's causing my jitter?

jarosoup · Tue Jun 06, 2006 7:22 am

Is your transmit rate bouncing around at all?

Hammy · Tue Jun 13, 2006 11:15 pm

On one link i was just watching, on receive it was 54 most of the time. Ocassionally it would go down to 48. I saw it go to 18 once. In regards to Tx, it was 6 most of the time, with ocassional jumps to 48 and 54.

Another link was mostly 24, but was quite regularly 18 with one drop to 12. The Tx was mostly 6 with regular jumps to 18 and 24. I did see a peak of 36.

I only watched either of these for about 3 or 4 minutes each. Is there a way to log these changes?

believewireless · Thu Jun 15, 2006 2:55 am

We are seeing the same problems with NStreme enabled:

23 packets transmitted, 23 packets received, 0% packet loss
round-trip min/avg/max = 8/18.0/40 ms

signal-strength: -64dBm
tx-signal-strength: -65dBm
noise-floor: -102dBm
signal-to-noise: 38dB
tx-ccq: 96%
rx-ccq: 98%
p-throughput: 37198
wds-link: yes
nstreme: yes
polling: yes
framing-mode: exact-size
framing-limit: 3200
framing-current-size: 2560
routeros-version: "2.9.24"

Hammy · Sun Jun 18, 2006 4:26 pm

I set the card's data rate down to 6 mbit only with 47 db SNR.

100 packets transmitted, 100 packets received, 0% packet loss
round-trip min/avg/max = 2/5.8/38 ms

N-Streme framer-policy is set to none. Why am I getting so much jitter?

               status: connected-to-ess
                 band: 5ghz-10mhz
            frequency: 5810MHz
              tx-rate: 6Mbps
              rx-rate: 6Mbps
                 ssid: "ICS2"
                bssid: 00:15:6D:10:0A:FA
           radio-name: "00156D100AFA"
      signal-strength: -57dBm
   tx-signal-strength: -62dBm
          noise-floor: -106dBm
      signal-to-noise: 49dB
               tx-ccq: 34%
               rx-ccq: 34%
         p-throughput: 5857
             wds-link: no
              nstreme: yes
              polling: yes
         framing-mode: none
     routeros-version: "2.9.24"
              last-ip: 10.10.2.1
  802.1x-port-enabled: yes
  authentication-type: none
           encryption: none
          compression: no
    current-tx-powers: 6Mbps:17,9Mbps:17,12Mbps:17,18Mbps:17,24Mbps:17,36Mbps:14,
                       48Mbps:12,54Mbps:11
  notify-external-fdb: no

jarosoup · Sun Jun 18, 2006 4:29 pm

Do you have periodic calibration set to enabled? Also, what is your tx/rx ccq values for that link?

Hammy · Sun Jun 18, 2006 4:39 pm

Above the CCQ was upper 30s. I believe before I started messing with it today, it was a fair amount higher (2x - 3x). Periodic calibration is set to default.

[admin@Mike's House] > /interface wireless print 
Flags: X - disabled, R - running 
 0  R name="wlan1" mtu=1500 mac-address=00:0B:6B:35:AE:C1 arp=enabled 
      disable-running-check=no interface-type=Atheros AR5213 radio-name="000B6B35AEC1" 
      mode=station ssid="ICS2" area="" frequency-mode=manual-txpower 
      country=no_country_set antenna-gain=0 frequency=5810 band=5ghz-10mhz 
      scan-list=default rate-set=configured supported-rates-b="" 
      supported-rates-a/g=6Mbps basic-rates-b="" basic-rates-a/g=6Mbps 
      max-station-count=2007 ack-timeout=52 tx-power-mode=default 
      noise-floor-threshold=default periodic-calibration=default 
      periodic-calibration-interval=60 burst-time=disabled dfs-mode=none 
      antenna-mode=ant-a wds-mode=disabled wds-default-bridge=none wds-default-cost=100 
      wds-cost-range=50-150 wds-ignore-ssid=no update-stats-interval=disabled 
      default-authentication=yes default-forwarding=yes default-ap-tx-limit=0 
      default-client-tx-limit=0 hide-ssid=no security-profile=default 
      disconnect-timeout=3s on-fail-retry-time=100ms preamble-mode=short compression=yes 
      allow-sharedkey=no

jo2jo · Wed Jun 21, 2006 7:45 am

can you temporaly break nstream and test to link p2p and report what you get?

jarosoup · Wed Jun 21, 2006 4:43 pm

Try to enable periodic-calibration as I think the default == disabled.

Hammy · Wed Jun 21, 2006 5:00 pm

As it turns out, both of the AP sectors were set to enabled, but I changed everything else (all CPE) to be enabled. We'll give it some time to see what that does (like till later tonight). I'll have to wait to test non-nstreme until I can have someone control both sides of the link to make sure someone doesn't get stranded.

Ping times?

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