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Suit Up

join:2003-07-21
Los Angeles, CA

2 edits
reply to NormanS

Re: Ping times

said by NormanS:

albeit with slightly higher deviation.

That's the problem. Due to the nature of TDMA/CDMA, your ping times are going to depend on node congestion. During peak hours they will usually be higher than during non-peak times. So that's why I say in general Cable ping times are going to be higher. But yes, in perfect conditions, they can be lower.


NormanS
I gave her time to steal my mind away
Premium,MVM
join:2001-02-14
San Jose, CA
kudos:11
Reviews:
·SONIC.NET

Congestion can afflict DSL, as well. A congested DSL aggregation router can send latency through the roof. OTOH, a well managed HFC can avoid congestion.

Deviation is a measure of the spread around the average. With my Interleaved ADSL2+ connection, deviation is normally 1ms to 2ms; same as my old Fastpath ADSL connection. My observation of cable latency is a deviation of 4ms to 5ms.
--
Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum



Suit Up

join:2003-07-21
Los Angeles, CA

said by NormanS:

Congestion can afflict DSL, as well. A congested DSL aggregation router can send latency through the roof. OTOH, a well managed HFC can avoid congestion.

Yes that's true, but that aspect can affect cable as well, but DSL doesn't have the same problem as the TDMA/CDMA management at the first hop.

If your deviation is only 4-5ms, then that's pretty good. Right now mine is 46.651ms: even though I managed to get a min of 11.140ms, the max was still 210.431ms.


mackey

join:2007-08-20
kudos:6

said by Suit Up:

If your deviation is only 4-5ms, then that's pretty good. Right now mine is 46.651ms: even though I managed to get a min of 11.140ms, the max was still 210.431ms.

The only times I've ever seen pings that high is when I'm also up/downloading stuff. I just ran 2 tests back to back, the first one with an idle connection and the next while running a speed test (got 29.8 Mbps on my 30/5 connection BTW).

1st one, all <11.5 ms:
PING www.google.com (74.125.224.212) 56(84) bytes of data.
64 bytes from lax02s02-in-f20.1e100.net (74.125.224.212): icmp_req=1 ttl=54 time=11.2 ms
64 bytes from lax02s02-in-f20.1e100.net (74.125.224.212): icmp_req=2 ttl=54 time=11.3 ms
64 bytes from lax02s02-in-f20.1e100.net (74.125.224.212): icmp_req=3 ttl=54 time=8.55 ms
64 bytes from lax02s02-in-f20.1e100.net (74.125.224.212): icmp_req=4 ttl=54 time=8.45 ms
64 bytes from lax02s02-in-f20.1e100.net (74.125.224.212): icmp_req=5 ttl=54 time=11.4 ms
64 bytes from lax02s02-in-f20.1e100.net (74.125.224.212): icmp_req=6 ttl=54 time=8.56 ms
64 bytes from lax02s02-in-f20.1e100.net (74.125.224.212): icmp_req=7 ttl=54 time=10.1 ms
64 bytes from lax02s02-in-f20.1e100.net (74.125.224.212): icmp_req=8 ttl=54 time=10.0 ms
64 bytes from lax02s02-in-f20.1e100.net (74.125.224.212): icmp_req=9 ttl=54 time=10.0 ms
64 bytes from lax02s02-in-f20.1e100.net (74.125.224.212): icmp_req=10 ttl=54 time=11.4 ms
 
--- www.google.com ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9011ms
rtt min/avg/max/mdev = 8.456/10.140/11.472/1.194 ms
 

2nd one, while downloading at 29.8 Mbps:
PING www.google.com (74.125.224.176) 56(84) bytes of data.
64 bytes from lax02s01-in-f16.1e100.net (74.125.224.176): icmp_req=1 ttl=54 time=99.9 ms
64 bytes from lax02s01-in-f16.1e100.net (74.125.224.176): icmp_req=2 ttl=54 time=151 ms
64 bytes from lax02s01-in-f16.1e100.net (74.125.224.176): icmp_req=3 ttl=54 time=197 ms
64 bytes from lax02s01-in-f16.1e100.net (74.125.224.176): icmp_req=4 ttl=54 time=234 ms
64 bytes from lax02s01-in-f16.1e100.net (74.125.224.176): icmp_req=5 ttl=54 time=284 ms
64 bytes from lax02s01-in-f16.1e100.net (74.125.224.176): icmp_req=6 ttl=54 time=336 ms
64 bytes from lax02s01-in-f16.1e100.net (74.125.224.176): icmp_req=7 ttl=54 time=12.3 ms
64 bytes from lax02s01-in-f16.1e100.net (74.125.224.176): icmp_req=8 ttl=54 time=21.0 ms
64 bytes from lax02s01-in-f16.1e100.net (74.125.224.176): icmp_req=9 ttl=54 time=16.7 ms
64 bytes from lax02s01-in-f16.1e100.net (74.125.224.176): icmp_req=10 ttl=54 time=37.6 ms
 
--- www.google.com ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9006ms
rtt min/avg/max/mdev = 12.309/139.249/336.479/113.838 ms
 

So yes, if you're downloading something large then your pings will creep up. Otherwise they stay rather low. If yours are creeping while not downloading then I would replace your router as it's the most likely cause.

/M


Suit Up

join:2003-07-21
Los Angeles, CA

I wasn't downloading or uploading anything. My guess is it's just congestion and still being on DOCSIS 2.