 MoracCat god
join:2001-08-30
Riverside, NJ
kudos:1
 ·Comcast
| Frequent ping spikes For a long time, I could use fping to send 1472 byte pings to my gateway or google.com and get fairly consistent results. Usually less than 20 ms on 99.9% of the pings.
Recently Comcast change my routing, moved the headend and enabled upstream bonding. Since then I'm seeing frequent ping spikes as high as 120 ms with that test (less so when using 32 byte pings). There's no packet loss and the vast majority of pings to my gateway (headend) are returned in less than 12 ms, but a small percentage are returned in 120 ms or more. I'd say between 3 to 5% of the packets are significantly delayed such that while about 95% of the packets are returned in less than 12 ms, the average is around 20 ms.
Line quality tests pass and overall jitter ranges from 1 to 18 ms in tests, but it seems like the high jumps in latency would cause problems, especially for VOIP (I use Ooma which seems okay most of the time) and gaming (haven't tested since the change) since around 3 to 5% of the packets would arrive much later than normal (effectively lost). I do notice that in the line quality tests, the max latency from my first hop is very high (sometimes in the seconds). That makes me think my gateway router is overloaded or something.
»/testhistory/464721/a2804
Is this "okay"? If not is this something I can get Comcast to fix since there's no packet loss and speeds are good?
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 tshirtPremium,MVM
join:2004-07-11
Snohomish, WA
kudos:3
·Comcast
| looking at your older tests shows a similar, occasional extreme high ping at the next to last hop (some were worse than what you have now) if you and others are constantly pinging the gateway then it's not suprising that it deprioratizes to the point of delaying or even not returning packets.
just as with downstream bonding there seem to be an adjustment/balancing period after upstream is enabled, so it may improve somewhat over the next few weeks, and it doesn't appear so far out of whack that comcast will change anything specifically for you, thought it never hurts to let them know directly if you are having problems. |
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MoracCat god
join:2001-08-30
Riverside, NJ
kudos:1 Reviews:
·Comcast
| It's not just pinging my gateway, it's pinging any server and doesn't require that high rate of pings. It's been a few weeks since I've seen this, but like I said it's not causing problems with downloads, uploads or packet loss so calling into Comcast is likely to be ignored.
Ping statistics for [gateway - 1st hop]:
Packets: Sent = 320, Received = 320, Lost = 0 (0% loss)
Approximate round trip times in milli-seconds:
Minimum = 12.4 ms, Maximum = 118.2 ms, Average = 19.0 ms
I just ran a test at »www.broadband.gov/qualitytest/mlabs.htm and got the following results:
Download speed: 36009 kbps
Upload speed: 6500 kbps
Latency: 57 ms
Jitter: 108 ms
The same test at »www.broadband.gov/qualitytest/ookla.htm gives:
Download speed: 9966 kbps
Upload speed: 7301 kbps
Latency: 27 ms
Jitter: 9 ms
So it's really the inconsistent jitter that's the problem here.
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 EGThe wings of lovePremium
join:2006-11-18
Union, NJ
kudos:9
1 edit | reply to Morac
Could anything on your machine / LAN be accessing the internet (an E-Mail client, anti virus/malware program, some other app. etc) at the times you are testing ? |
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MoracCat god
join:2001-08-30
Riverside, NJ
kudos:1 Reviews:
·Comcast
| Nothing has changed and I've run tests at random times during the day (and over the course of several weeks) so I'd say no. Plus my router doesn't indicate any traffic.
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