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ualdayan

join:2004-07-17
Antioch, TN
reply to Oedipus

Re: [Speed] Comcast Business Class Speed Upgraded in California

Guys, guys, calm down. Powerboost is still there. It's the speedtest.comcast.net that's changed. (And it changed awhile back, not as part of these changes). It downloads/uploads for longer and that means a larger percentage of the test happens at non powerboosted speeds - therefore it reports a lower result. A phone/tablet maxing out a WiFi connection at optimal conditions can still result in a very high Mbps speedtest because they haven't changed the app on mobile devices to use the larger data payload that the website based ones do.



EG
The wings of love
Premium
join:2006-11-18
Union, NJ
kudos:10

Withdrawn. Mods please delete.


n_w95482
Premium
join:2005-08-03
Ukiah, CA
reply to ualdayan

said by ualdayan:

Guys, guys, calm down. Powerboost is still there. It's the speedtest.comcast.net that's changed. (And it changed awhile back, not as part of these changes). It downloads/uploads for longer and that means a larger percentage of the test happens at non powerboosted speeds - therefore it reports a lower result. A phone/tablet maxing out a WiFi connection at optimal conditions can still result in a very high Mbps speedtest because they haven't changed the app on mobile devices to use the larger data payload that the website based ones do.

In their defense, ShaperProbe numbers were posted earlier, which splits the PB/non-PB results.

As for the Comcast test, in my recent experience, it still greatly skews results towards best-case PB speeds. I just ran a test a couple of minutes ago and hit 75 Mbps down, before dropping to 23 at about 80% through it. It reported 67.2 Mbps down at the end of it. I suppose that's understandable considering it dropped off near the end of it. However, it reported 22.36 Mbps up, even though my upstream PB ran out at about 40% through that part of the test and dropped to 5 Mbps for the rest of it.

I typically use the Comcast speedtest to check for local/regional congestion (and e-peen numbers ), and ShaperProbe to check for provisioning and sustained throughput. Sometimes I also do an FTP upload to my website to check sustained upstream speeds.

While I find the variance in PB reported earlier to be odd/interesting (ex. ropeguru See Profile's results are pretty close to residential Blast PB), I wouldn't mind it much myself if it got reduced. I was on 50/10 until mid-August, and I didn't mind the complete lack of it there.
--
KI6RIT


ropeguru
Premium
join:2001-01-25
Mechanicsville, VA
reply to ualdayan

said by ualdayan:

Guys, guys, calm down. Powerboost is still there. It's the speedtest.comcast.net that's changed. (And it changed awhile back, not as part of these changes). It downloads/uploads for longer and that means a larger percentage of the test happens at non powerboosted speeds - therefore it reports a lower result. A phone/tablet maxing out a WiFi connection at optimal conditions can still result in a very high Mbps speedtest because they haven't changed the app on mobile devices to use the larger data payload that the website based ones do.

Cannot say that is true here. I do not get the initial burst at all even on the Comcast speedtest. As late as this weekend I was still seeing the high burst rates, 70+/10+, no matter what Comcast test I hit. Additionally, shaper probe is no longer showing the higher burst ratee that I was seeing before.

So they have screwed something up when rolling out the speed increases. At least here in this area.

Capacity estimation before:

Estimating capacity:
Upstream: 20946 Kbps.
Downstream: 129069 Kbps.

Capacity estimation now:

Estimating capacity:
Upstream: 7700 Kbps.
Downstream: 36244 Kbps.

ualdayan

join:2004-07-17
Antioch, TN

said by ropeguru:

said by ualdayan:

Guys, guys, calm down. Powerboost is still there. It's the speedtest.comcast.net that's changed. (And it changed awhile back, not as part of these changes). It downloads/uploads for longer and that means a larger percentage of the test happens at non powerboosted speeds - therefore it reports a lower result. A phone/tablet maxing out a WiFi connection at optimal conditions can still result in a very high Mbps speedtest because they haven't changed the app on mobile devices to use the larger data payload that the website based ones do.

Cannot say that is true here. I do not get the initial burst at all even on the Comcast speedtest. As late as this weekend I was still seeing the high burst rates, 70+/10+, no matter what Comcast test I hit. Additionally, shaper probe is no longer showing the higher burst ratee that I was seeing before.

So they have screwed something up when rolling out the speed increases. At least here in this area.

Capacity estimation before:

Estimating capacity:
Upstream: 20946 Kbps.
Downstream: 129069 Kbps.

Capacity estimation now:

Estimating capacity:
Upstream: 7700 Kbps.
Downstream: 36244 Kbps.

Hmm, maybe all the business line owners are rebooting their modems and running speed tests at the moment in your area? : )


JohnInSJ
Premium
join:2003-09-22
Aptos, CA
reply to greg925

rebooted this morning in san jose
12/2 is now

Upstream: No shaper detected.
Median received rate: 3397 Kbps.

Downstream: Burst size: 9843-9962 KB; Shaping rate: 17024 Kbps.

17/3 - nice.

Not sure why it didn't see a speedboost on the uplink.
--
My place : »www.schettino.us



pflog
Bueller? Bueller?
Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3
reply to ropeguru

said by ropeguru:

said by ualdayan:

Guys, guys, calm down. Powerboost is still there. It's the speedtest.comcast.net that's changed. (And it changed awhile back, not as part of these changes). It downloads/uploads for longer and that means a larger percentage of the test happens at non powerboosted speeds - therefore it reports a lower result. A phone/tablet maxing out a WiFi connection at optimal conditions can still result in a very high Mbps speedtest because they haven't changed the app on mobile devices to use the larger data payload that the website based ones do.

Cannot say that is true here. I do not get the initial burst at all even on the Comcast speedtest. As late as this weekend I was still seeing the high burst rates, 70+/10+, no matter what Comcast test I hit. Additionally, shaper probe is no longer showing the higher burst ratee that I was seeing before.

So they have screwed something up when rolling out the speed increases. At least here in this area.

Capacity estimation before:

Estimating capacity:
Upstream: 20946 Kbps.
Downstream: 129069 Kbps.

Capacity estimation now:

Estimating capacity:
Upstream: 7700 Kbps.
Downstream: 36244 Kbps.

I am seeing the same thing. Very little or no power boost now. And the shaping is not smooth at all for the sustained rate. I'm actually all for zero power boost if the shaping were smooth for the 27/7 rates, as it would let me do proper QoS and not have to deal with powerboost funkiness. But it seems the boost is kinda/sorta there, but misconfigured, or the shaping for the 27/7 is not quite tweaked properly.

Perhaps SteveTeow See Profile can shed some light?
--
"Women. Can't live with 'em, pass the beer nuts." -Norm


pflog
Bueller? Bueller?
Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3

Actually, I take that back. I am seeing ~65 Mbps boost now. Previously I was seeing 100+. So that's still there, just not as much. I'm fine with that, although I still wish there was a way to opt out of powerboost entirely.

quote:
Upstream: No shaper detected.
Median received rate: 7242 Kbps.

Downstream: Burst size: 20136-20323 KB; Shaping rate: 28634 Kbps.

--
"Women. Can't live with 'em, pass the beer nuts." -Norm


Chester2

join:2000-10-17
Menlo Park, CA
Reviews:
·Comcast Business..
reply to ropeguru

said by ropeguru:

said by ualdayan:

Guys, guys, calm down. Powerboost is still there. It's the speedtest.comcast.net that's changed. (And it changed awhile back, not as part of these changes). It downloads/uploads for longer and that means a larger percentage of the test happens at non powerboosted speeds - therefore it reports a lower result. A phone/tablet maxing out a WiFi connection at optimal conditions can still result in a very high Mbps speedtest because they haven't changed the app on mobile devices to use the larger data payload that the website based ones do.

Cannot say that is true here. I do not get the initial burst at all even on the Comcast speedtest. As late as this weekend I was still seeing the high burst rates, 70+/10+, no matter what Comcast test I hit. Additionally, shaper probe is no longer showing the higher burst ratee that I was seeing before.

So they have screwed something up when rolling out the speed increases. At least here in this area.

Capacity estimation before:

Estimating capacity:
Upstream: 20946 Kbps.
Downstream: 129069 Kbps.

Capacity estimation now:

Estimating capacity:
Upstream: 7700 Kbps.
Downstream: 36244 Kbps.

I'm seeing the same thing here is Silicon Valley. Speeds have been all over the board since yesterday. Sometimes I get 17/3 sometimes I don't even get close to 12/2. PowerBoost seems to come and go. Estimated Capacity is only a small fraction of what it used to be any time I run ShaperProbe.

Here is my latest test. Note I got 17/3 last night:

Shaper Detection Module.

Connected to server 74.63.50.34.

Estimating capacity:
Upstream: 1129 Kbps.
Downstream: 2248 Kbps.

The measurement will take upto 2.5 minutes. Please wait.

Checking for traffic shapers:

Upstream: No shaper detected.
Median received rate: 1120 Kbps.

Downstream: No shaper detected.
Median received rate: 2202 Kbps.
--
Craig
»CraigHarris.org My BLOG on Motorcycles, Computer Stuff & Deals.


pflog
Bueller? Bueller?
Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3
reply to greg925

Click for full size
 
Definitely looks like I've lost power boost on the upstream side, and either all or most of it on the downstream side.
--
"Women. Can't live with 'em, pass the beer nuts." -Norm


NetFixer
Freedom is NOT Free
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage

1 edit
reply to JohnInSJ

said by JohnInSJ:

rebooted this morning in san jose
12/2 is now

Upstream: No shaper detected.
Median received rate: 3397 Kbps.

Downstream: Burst size: 9843-9962 KB; Shaping rate: 17024 Kbps.

17/3 - nice.

Not sure why it didn't see a speedboost on the uplink.

I randomly see no PowerBoost reported on both the upstream and the downstream when testing with ShaperProbe.

But I would actually like to see Comcast offer a config option to disable PowerBoost anyway. In fact, I usually run through a VLAN segment of my Netgear GS108e switch just behind my cable modem so that I can use its rate limiting QoS capability to compensate for the sometimes extreme buffer bloat effect that the combination of Comcast's PowerBoost and channel bonding sometimes exacerbate. Since the "leak" of Comcast's plan to increase the bandwidth for the two lower business class tiers, I have removed that VLAN connection until I could verify exactly what the new speed tier delivered. Now that I know, I will probably put that rate limiting VLAN segment back into operation.

EDIT:
I just put my rate limiting VLAN segment back into service, and I thought I would post some ICSI Netalyzr results to illustrate why I did it:


Netalyzr results without rate limiting


The 690 ms upstream buffer value above is actually an improvement over the ~1000 ms value I was seeing prior to the rate increase from 2mbps to 3mbps (which makes sense because the improved excess buffering ratio tracks the real bandwidth increase ratio).


Netalyzr results with rate limiting


Here is a link to an ICSI FAQ that explains the effects of excessive buffering (AKA buffer bloat): »n3.netalyzr.icsi.berkeley.edu/in···fer.html

Here is a brief extract from that FAQ:
said by ICSI :
Often, your computer wants to send or receive data faster than some point in the network allows. Thus that point needs a buffer to store this data until it is able to send it. The problem arises when the buffer is too large or too small. If the buffer is too small, network protocols such as TCP are unable to send as fast as the network allows. If the buffer is too large, a single transfer will fill up the buffer, delaying all other traffic.

Currently, a lot of users have networks which are significantly over-buffered. As a result, if the network is running at capacity, packets may be substantially delayed. This is why, for example, BitTorrent may slow down a user's web surfing, even though TCP is able to share all the bandwidth, the file transfer fills up the buffer which now slows down all other traffic.

In other words, those of you who are bemoaning an apparent loss of PowerBoost with the new speed increase, might want to be thankful instead of angry.
--
We can never have enough of nature.
We need to witness our own limits transgressed, and some life pasturing freely where we never wander.


ropeguru
Premium
join:2001-01-25
Mechanicsville, VA
reply to pflog

said by pflog:

Definitely looks like I've lost power boost on the upstream side, and either all or most of it on the downstream side.

Exactly what I am seeing here.

But as someone else was saying. Just deal with it! J/K


NetFixer
Freedom is NOT Free
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage

said by ropeguru:

said by pflog:

Definitely looks like I've lost power boost on the upstream side, and either all or most of it on the downstream side.

Exactly what I am seeing here.

But as someone else was saying. Just deal with it! J/K

Or perhaps even be happy about the reduced PowerBoost?

Some of us actually go to the trouble to limit the negative effects of PowerBoost:
»Re: [Speed] Comcast Business Class Speed Upgraded in California

Of course, the universal YMMV disclaimer is always in effect.
--
We can never have enough of nature.
We need to witness our own limits transgressed, and some life pasturing freely where we never wander.


pflog
Bueller? Bueller?
Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3

I can understand folks being upset about losing something they had for a long time, especially if their rep told them to expect it.

That said, I for one would much rather have sustained 27/7 with no PB and have it shaped properly, which lets me control things much more on my end via shaping/QoS.

Anyone know of a good consistent host to wget/fetch a file from in California (at least 256 MB) so I can do a pcap capture and see how the throughput graph looks for sustained transfers?
--
"Women. Can't live with 'em, pass the beer nuts." -Norm



JigglyWiggly

join:2009-07-12
Pleasanton, CA

powerboost on buisness is really nice.
Like if you host a bunch of images, it will load faster with the high upload rate for the short period. Especially if those pictures are like 8 megabytes.



JohnInSJ
Premium
join:2003-09-22
Aptos, CA

Likely it will return. Just give it a few days for them to get the kinks out.
--
My place : »www.schettino.us



ropeguru
Premium
join:2001-01-25
Mechanicsville, VA
reply to pflog

said by pflog:

I can understand folks being upset about losing something they had for a long time, especially if their rep told them to expect it.

That said, I for one would much rather have sustained 27/7 with no PB and have it shaped properly, which lets me control things much more on my end via shaping/QoS.

Anyone know of a good consistent host to wget/fetch a file from in California (at least 256 MB) so I can do a pcap capture and see how the throughput graph looks for sustained transfers?

Look around at some of the linux mirrors where you can download the DVD. THat will give you a good 4GB worth of data to test with.

I am getting ready for work now but if I have a little time when I get there, I will take a quick look and see if I can find on for ya.


pflog
Bueller? Bueller?
Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3
reply to greg925

Click for full size
Picked a local FreeBSD mirror to fetch a large file from, and the speeds start out relatively smoothly shaped. But then the shaping becomes less smooth and it bounces around between slow and fast rather erratically.

Anyone else in California on a 22/5 (now 27/7?) plan who can do a pcap and generate similar data to see if the shaping is broken in other locations as well?
--
"Women. Can't live with 'em, pass the beer nuts." -Norm


espaeth
Digital Plumber
Premium,MVM
join:2001-04-21
Minneapolis, MN
kudos:2

said by pflog:

Anyone else in California on a 22/5 (now 27/7?) plan who can do a pcap and generate similar data to see if the shaping is broken in other locations as well?

I don't have the data to post right now, but yes, I'm observing the same behavior in the Minneapolis market.


pflog
Bueller? Bueller?
Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3

said by espaeth:

said by pflog:

Anyone else in California on a 22/5 (now 27/7?) plan who can do a pcap and generate similar data to see if the shaping is broken in other locations as well?

I don't have the data to post right now, but yes, I'm observing the same behavior in the Minneapolis market.

Ok, cool. I was starting to worry it was my TCP stack, but I've fiddled with a number of things including different congestion control algorithms, etc and am seeing similar results and the fact that it's relatively smooth in the beginning then erratic after the point where powerboost would normally cease tells me it is something on Comcast's end.

I'm guessing they are just ironing out the kinks in the buffering/etc with the new speed profiles?
--
"Women. Can't live with 'em, pass the beer nuts." -Norm


JohnInSJ
Premium
join:2003-09-22
Aptos, CA

said by pflog:

I'm guessing they are just ironing out the kinks in the buffering/etc with the new speed profiles?

Seems like it to me, too, on whatever 12/2 is now I saw a brief moment of speedboost on the uplink this morning. Once. Weird.
--
My place : »www.schettino.us


espaeth
Digital Plumber
Premium,MVM
join:2001-04-21
Minneapolis, MN
kudos:2
reply to pflog

Yeah, after seeing that behavior I ended up using tc to smooth the traffic myself using hierarchical token buckets on my Linux NAT box.

What I'm doing is loosely based on this: »www.iplocation.net/tools/traffic-control.php

I've had favorable results shaping to 30,000,000 bps so far.


ualdayan

join:2004-07-17
Antioch, TN

From my latest bill, the name of my plan changed to: "Ultra Internet 22Mbps with Powerboost speeds up to 30Mbps". I just upgraded from the 12Mbps to the 22Mbps this month, so can anybody else say if that was always there or not on their bill too?



ropeguru
Premium
join:2001-01-25
Mechanicsville, VA

1 edit

Here is what is on mine:

Internet Premium Pkg 10/05 - 11/04 99.95
Business Class Internet

Here is what it was:

Ultra Internet Service 09/05 - 10/04 99.95

To add that my July bill had this:

Ultra Internet Service 08/05 - 09/04 99.95
Includes PowerBoost

So they have taken away powerboost without notifying us business customers and changed the package name TWICE! Would be nice if one of the folks from Corporate would chime in and tell us what is going on.

Guess it is time to call my rep and hammer on him.

EDIT: Added July bill and changed some wording


biomesh
Premium
join:2006-07-08
Tomball, TX

The speeds at »business.comcast.com/smb/service···et/plans have been updated, but the prices have not increased.

I hope this just means the speeds were increased and not the prices going forward.



ropeguru
Premium
join:2001-01-25
Mechanicsville, VA

said by biomesh:

The speeds at »business.comcast.com/smb/service···et/plans have been updated, but the prices have not increased.

I hope this just means the speeds were increased and not the prices going forward.

I just got a response back from my rep that assured me that the PowerBoost speeds I used to see have not been removed for my market. He advised me to contact customer care, and I will, to check on the issue. I also advised him that if the terms had changed, I would possibly be looking to cease the current contract with no ETF.


NetFixer
Freedom is NOT Free
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage

said by ropeguru:

said by biomesh:

The speeds at »business.comcast.com/smb/service···et/plans have been updated, but the prices have not increased.

I hope this just means the speeds were increased and not the prices going forward.

I just got a response back from my rep that assured me that the PowerBoost speeds I used to see have not been removed for my market. He advised me to contact customer care, and I will, to check on the issue. I also advised him that if the terms had changed, I would possibly be looking to cease the current contract with no ETF.

Wow, you actually have a sales rep who returns your calls/emails? I have not been able to get any kind of reply from my "official" sales rep since the day that I signed the contract.

Anything I have needed since that day, I have had to just make multiple calls to support, or use the »Comcast Direct forum (or just post here and hope that someone from Comcast would see the thread).
--
We can never have enough of nature.
We need to witness our own limits transgressed, and some life pasturing freely where we never wander.


ropeguru
Premium
join:2001-01-25
Mechanicsville, VA

Guess I should feel lucky. I have also posted in the Direct forum and ComcastSteve just replied. However, what he replied with really didn't make much sense. So I am awaiting further clarification.



pflog
Bueller? Bueller?
Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3
reply to greg925

I actually wouldn't be that upset about losing power boost, as I kind of prefer a consistent, stable connection. However:

- with these speed changes, the downloads are now erratic as I and others have pointed out. Hopefully this is just a hiccup and not permanent.

- lack of notification of the change is rather troubling, especially for people like ropeguru See Profile who was told by their rep they had it. I don't recall whether I was told about it or not, but if I had been and it suddenly went away, that would concern me as a breech of contract.

I would be thrilled with 27/7 if it were consistent. So hopefully they will fix the erratic throughput issue with their shaping settings. But for those that rely on powerboost, hopefully you get it back.

I will say it again: I wish there was a way to opt out of powerboost. It would make doing my own traffic management much easier.
--
"Women. Can't live with 'em, pass the beer nuts." -Norm



ropeguru
Premium
join:2001-01-25
Mechanicsville, VA

said by pflog:

- lack of notification of the change is rather troubling, especially for people like ropeguru See Profile who was told by their rep they had it. I don't recall whether I was told about it or not, but if I had been and it suddenly went away, that would concern me as a breech of contract.

While loss of powerboost is something I am upset about, I am more upset that we pay higher rates for business level service and there is absolutely NO communication that changes are coming or have even taken place which effect our service.

I will say that since I have had Comcast business class service, going on three plus years now, the ONLY communication I have received from them was the note in my bill about the modem rental fee and sales crap. Nothing else.