This is a follow-up to this thread:
And threads from DSL reports mentioned in that thread.
I have also documented this issue extensively here:
Here's a quick summary:
- I am a business class customer previously on a 22/5 plan that had uncapped powerboost. After powerboost, my speeds were consistent at the subscribed rate (22 Mbps)
- I believe I am on a Cisco uBR10k CMTS
- in early October 2012, Comcast pushed a new 27/7 boot file that now implements capped powerboost (I am using the terms 'capped' and 'uncapped' per this paper: http://groups.csail.mit.edu/ana/Publications/p7-bauer.pdf)
- with the new boot file, speeds during powerboost are consistent, but after powerboost ends I see a classic TCP sawtooth traffic pattern. UDP traffic is shaped properly.
I suspect it is related to the type of CMTS I am on and hopefully it's just an oversight in its configuration since the 22/5 plan was uncapped powerboost and the 27 boot file appears to be capped powerboost.
Some folks from Comcast who frequent dsl reports are looking into this, but I wanted to see how widespread it is. The above link has a link to how I'm generating the Wireshark IO graphs if you want to see if you're impacted.
Any update on this? Is the broken shaping waiting on Cisco 10k ipv6 deployment or replacement of the Cisco 10k's? Any idea of when this will be fixed? My contract is up in 2 months, so I'm evaluating my options here.
No updates, pflog. I got one, though. It was a letter from Comcast stating that they'd close my case if they hadn't heard from me by December 29. The letter was mailed on December 28. Called Tech Support and left a message for the letter writer. Guess what? No update. If you have an option, exercise it.
Called on Monday -- Recorded the call. Was told it'd be 24/48 hours to get paperwork to me. No problem. Rep gave me his email for follow-ups. Emailed him a few minutes later and thanked him for his time. He replied and said "you're welcome," included my account number, and reassured a follow up.
Emailed Thursday and asked for an update. No reply.
Emailed Friday and asked for an update. No reply.
Emailed the next Monday and CCd my lawyer. No reply.
10 days later (Wednesday, 1/16) Got a reply to my original (Thursday) email. Was told he was "out of the office" and would "have an update by the end of business day (sic)".
Guess what? No reply.
Things for consideration: I've paid for 10 days of service now that I wanted to disconnect. The "retention specialist" did not have an "out of office" reply. The phone number to reach him is the 800 support number.
This is going to be big. I guarantee it.
Pflog, thanks again for bringing this to our attention, and per other discussions on this topic, I believe the network issue has been resolved. Please let us know if you are still seeing issues.
In addition, I thought it may be helpful to review the bursting capabilities available with Business Class Internet. Please note: “powerboost” is an Xfinity residential internet feature. However, Business customers will see greater speeds during the initial portion of any file download since our Business Class Internet Starter and Premium includes bursting capabilities above the service levels. For example, when a BCI Starter (16/3) customer begins to download a file, the first 10 MB of the file will download at the speed of 22 Mbps, and the rest at the purchased service level of 16 Mbps.
We are also sorry to lose mytempollc not only as a customer, but as a valued member of this forum.