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High latency from WLC to wireless client but not vice versa

 
ONVZ
Advisor

‎02-05-2013 07:01 AM

‎02-05-2013 07:01 AM

High latency from WLC to wireless client but not vice versa

Hi all,


Running MSM765zl, firmware 5.7.1.0-12379, in 5412zl switch, APs are MSM430, client are e.g. Dell Latitude 6520.
Because of performance complaints I did some checking.

These latency figures doesn't seem good. In fact odd seeing that it looks only one way > towards wlan client
Or am I missing something?

 

Regards,

 

Jaap

 

From MSM765zl to wlan client:

CLI# ping x.x.x.x
PING x.x.x.x (x.x.x.x): 56 data bytes
64 bytes from x.x.x.x: icmp_seq=0 ttl=127 time=51.0 ms
64 bytes from x.x.x.x: icmp_seq=1 ttl=127 time=75.6 ms
64 bytes from x.x.x.x: icmp_seq=2 ttl=127 time=100.7 ms
64 bytes from x.x.x.x: icmp_seq=3 ttl=127 time=21.7 ms
64 bytes from x.x.x.x: icmp_seq=4 ttl=127 time=46.1 ms
64 bytes from x.x.x.x: icmp_seq=5 ttl=127 time=69.1 ms
64 bytes from x.x.x.x: icmp_seq=6 ttl=127 time=93.0 ms
64 bytes from x.x.x.x: icmp_seq=7 ttl=127 time=14.7 ms
64 bytes from x.x.x.x: icmp_seq=8 ttl=127 time=38.6 ms
64 bytes from x.x.x.x: icmp_seq=9 ttl=127 time=62.5 ms
64 bytes from x.x.x.x: icmp_seq=10 ttl=127 time=87.0 ms
64 bytes from x.x.x.x: icmp_seq=11 ttl=127 time=110.5 ms
64 bytes from x.x.x.x: icmp_seq=12 ttl=127 time=32.2 ms
64 bytes from x.x.x.x: icmp_seq=13 ttl=127 time=56.2 ms
64 bytes from x.x.x.x: icmp_seq=14 ttl=127 time=80.0 ms
64 bytes from x.x.x.x: icmp_seq=15 ttl=127 time=104.5 ms
64 bytes from x.x.x.x: icmp_seq=16 ttl=127 time=25.5 ms

--- x.x.x.x ping statistics ---
17 packets transmitted, 17 packets received, 0% packet loss
round-trip min/avg/max = 14.7/62.8/110.5 ms

 

From wlan client to WLC:

C:\Temp\iperf>ping -t x.x.x.x

Pinging x.x.x.x with 32 bytes of data:

Reply from x.x.x.x: bytes=32 time=3ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=1ms TTL=63
Reply from x.x.x.x: bytes=32 time=1ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=1ms TTL=63
Reply from x.x.x.x: bytes=32 time=1ms TTL=63
Reply from x.x.x.x: bytes=32 time=4ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=1ms TTL=63
Reply from x.x.x.x: bytes=32 time=1ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=1ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=3ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=3ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=1ms TTL=63
Reply from x.x.x.x: bytes=32 time=3ms TTL=63
Reply from x.x.x.x: bytes=32 time=1ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=1ms TTL=63
Reply from x.x.x.x: bytes=32 time=1ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=59ms TTL=63
Reply from x.x.x.x: bytes=32 time=86ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=2ms TTL=63
Reply from x.x.x.x: bytes=32 time=1ms TTL=63
Reply from x.x.x.x: bytes=32 time=1ms TTL=63

Ping statistics for x.x.x.x:
    Packets: Sent = 38, Received = 38, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 1ms, Maximum = 86ms, Average = 5ms

 
From server to wlan client:

C:\Temp\iperf>ping x.x.x.x -t

Pinging x.x.x.x with 32 bytes of data:

Reply from x.x.x.x: bytes=32 time=97ms TTL=127
Reply from x.x.x.x: bytes=32 time=68ms TTL=127
Reply from x.x.x.x: bytes=32 time=92ms TTL=127
Reply from x.x.x.x: bytes=32 time=93ms TTL=127
Reply from x.x.x.x: bytes=32 time=100ms TTL=127
Reply from x.x.x.x: bytes=32 time=15ms TTL=127
Reply from x.x.x.x: bytes=32 time=121ms TTL=127
Reply from x.x.x.x: bytes=32 time=38ms TTL=127
Reply from x.x.x.x: bytes=32 time=54ms TTL=127
Reply from x.x.x.x: bytes=32 time=74ms TTL=127
Reply from x.x.x.x: bytes=32 time=90ms TTL=127
Reply from x.x.x.x: bytes=32 time=96ms TTL=127
Reply from x.x.x.x: bytes=32 time=61ms TTL=127
Reply from x.x.x.x: bytes=32 time=65ms TTL=127
Reply from x.x.x.x: bytes=32 time=83ms TTL=127
Reply from x.x.x.x: bytes=32 time=100ms TTL=127
Reply from x.x.x.x: bytes=32 time=15ms TTL=127
Reply from x.x.x.x: bytes=32 time=14ms TTL=127
Reply from x.x.x.x: bytes=32 time=22ms TTL=127
Reply from x.x.x.x: bytes=32 time=39ms TTL=127
Reply from x.x.x.x: bytes=32 time=61ms TTL=127
Reply from x.x.x.x: bytes=32 time=17ms TTL=127
Reply from x.x.x.x: bytes=32 time=38ms TTL=127
Reply from x.x.x.x: bytes=32 time=57ms TTL=127
Reply from x.x.x.x: bytes=32 time=75ms TTL=127
Reply from x.x.x.x: bytes=32 time=80ms TTL=127
Reply from x.x.x.x: bytes=32 time=94ms TTL=127
Reply from x.x.x.x: bytes=32 time=14ms TTL=127
Reply from x.x.x.x: bytes=32 time=2ms TTL=127
Reply from x.x.x.x: bytes=32 time=26ms TTL=127
Reply from x.x.x.x: bytes=32 time=97ms TTL=127
Reply from x.x.x.x: bytes=32 time=168ms TTL=127
Reply from x.x.x.x: bytes=32 time=2ms TTL=127
Reply from x.x.x.x: bytes=32 time=1ms TTL=127
Reply from x.x.x.x: bytes=32 time=73ms TTL=127
Reply from x.x.x.x: bytes=32 time=85ms TTL=127
Reply from x.x.x.x: bytes=32 time=106ms TTL=127
Reply from x.x.x.x: bytes=32 time=16ms TTL=127
Reply from x.x.x.x: bytes=32 time=39ms TTL=127
Reply from x.x.x.x: bytes=32 time=108ms TTL=127
Reply from x.x.x.x: bytes=32 time=109ms TTL=127
Reply from x.x.x.x: bytes=32 time=13ms TTL=127
Reply from x.x.x.x: bytes=32 time=33ms TTL=127
Reply from x.x.x.x: bytes=32 time=54ms TTL=127
Reply from x.x.x.x: bytes=32 time=70ms TTL=127
Reply from x.x.x.x: bytes=32 time=94ms TTL=127
Reply from x.x.x.x: bytes=32 time=106ms TTL=127
Reply from x.x.x.x: bytes=32 time=25ms TTL=127
Reply from x.x.x.x: bytes=32 time=36ms TTL=127
Reply from x.x.x.x: bytes=32 time=111ms TTL=127
Reply from x.x.x.x: bytes=32 time=26ms TTL=127

Ping statistics for x.x.x.x:
    Packets: Sent = 51, Received = 51, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 1ms, Maximum = 168ms, Average = 62ms

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