nanog mailing list archives
Re: [NANOG] Comcast latency
From: John Osmon <josmon () rigozsaurus com>
Date: Wed, 30 Apr 2008 17:31:48 -0600
On Wed, Apr 30, 2008 at 09:46:38AM -0400, Jim Popovitch wrote:
Looks can sometimes be deceiving. ;-) I've seen Comcast drop packets left and right, but show 8Mbs/2Mbs on speed test sites. Other times I've seen the opposite, zero PL but extremely high latency (seconds, double digits!)... all the while non-dynamic web pages (probably cached upstream) loaded just fine.
I had mrt running across a Comcast connection that indicated a 14000 ms RTT for one packet out of several hundred. I wasn't sure that was a trustworthy measurement, but it sure suprised me. Another time, I had a VOIP conversation fall apart once with somone on a Comcast link. When the jitter finally fell into a reasonable range, the call sounded *great* again -- but there was a 4 second latency that had been introduced. It was wild. I kept wondering -- "where was this buffered? Are we on a satellite backup route?" We kept the conversation going for a while just for the sheer novelty. Overall, my data points on Comcast point to a pretty solid service -- but the outliers are pretty impressive in their own right. _______________________________________________ NANOG mailing list NANOG () nanog org http://mailman.nanog.org/mailman/listinfo/nanog
Current thread:
- [NANOG] Comcast latency mack (Apr 29)
- Re: [NANOG] Comcast latency Steven M. Bellovin (Apr 30)
- Re: [NANOG] Comcast latency Jim Popovitch (Apr 30)
- Re: [NANOG] Comcast latency John Osmon (Apr 30)
- Re: [NANOG] Comcast latency Jim Popovitch (Apr 30)
- Re: [NANOG] Comcast latency Big Wave Dave (Apr 30)
- Re: [NANOG] Comcast latency Steven M. Bellovin (Apr 30)