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pflog
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join:2001-09-01
El Dorado Hills, CA
kudos:3
reply to ComcastDJ

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

Click for full size
said by ComcastDJ:

said by pflog:

Should we be rebooting our modems and testing again?

If you are not getting the new speeds, a reboot would force the modem to take the new config. The configs haven't changed since last week.

Thank you.
DJ

Nope, not working for me. Still see very erratic speeds.
--
"Women. Can't live with 'em, pass the beer nuts." -Norm

ComcastDJ

join:2012-10-18
Philadelphia, PA

said by pflog:

said by ComcastDJ:

said by pflog:

Should we be rebooting our modems and testing again?

If you are not getting the new speeds, a reboot would force the modem to take the new config. The configs haven't changed since last week.

Thank you.
DJ

Nope, not working for me. Still see very erratic speeds.

Can you post ShaperProbe results also?


pflog
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El Dorado Hills, CA
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said by ComcastDJ:

Can you post ShaperProbe results also?

Sure, but the average overall speed is fine. The speeds just bounce constantly between like 5MB/s (way above subscribed rate) and then down below 2MB/s (TCP stack reacting to packet loss).

It's clearly not being shaped properly after PB.

Shaperprobe results:

Connected to server 83.212.4.36.

Estimating capacity:
Upstream: 7275 Kbps.
Downstream: 34500 Kbps.

Upstream: No shaper detected.
Median received rate: 7275 Kbps.

Downstream: Burst size: 20790-20986 KB; Shaping rate: 28448 Kbps.


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


pflog
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join:2001-09-01
El Dorado Hills, CA
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Click for full size
0-10 seconds
Click for full size
10-20 seconds
Click for full size
20-30 seconds
Here's the IO graph for the first, second and third 10 seconds. You can see when power boost ends, the speeds going nuts.
--
"Women. Can't live with 'em, pass the beer nuts." -Norm

ComcastDJ

join:2012-10-18
Philadelphia, PA

Got ya. Is this causing issues for something you are doing on this connection?

Thank you.
DJ



pflog
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El Dorado Hills, CA
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said by ComcastDJ:

Got ya. Is this causing issues for something you are doing on this connection?

Thank you.
DJ

Yes, it affects latency sensitive applications (e.g. working remotely over VPN to a VNC session).

But more to the point - it's just plain broken. If this is "ok" and Comcast has no plans to fix it, we need to know ASAP, because, at least for me, I would look into either downgrading my speeds or seeking alternatives to the service (without an ETF).
--
"Women. Can't live with 'em, pass the beer nuts." -Norm


pflog
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reply to ropeguru

ropeguru See Profile - since you said you're not seeing the erratic speeds after PB ends, would you mind collecting some data? There is a wireshark version for windows if you're not on a mac/linux/bsd box. Would you mind generating a pcap trace as I've done so I can look at it?

I can help you find a local mirror so we're comparing apples to apples for the test.
--
"Women. Can't live with 'em, pass the beer nuts." -Norm



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

said by pflog:

ropeguru See Profile - since you said you're not seeing the erratic speeds after PB ends, would you mind collecting some data? There is a wireshark version for windows if you're not on a mac/linux/bsd box. Would you mind generating a pcap trace as I've done so I can look at it?

I can help you find a local mirror so we're comparing apples to apples for the test.

I'd be happy to as well (via linux) for 15/3 speeds

Edit: just tell me what to do to recreate your scenario
--
My place : »www.schettino.us


pflog
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said by JohnInSJ:

said by pflog:

ropeguru See Profile - since you said you're not seeing the erratic speeds after PB ends, would you mind collecting some data? There is a wireshark version for windows if you're not on a mac/linux/bsd box. Would you mind generating a pcap trace as I've done so I can look at it?

I can help you find a local mirror so we're comparing apples to apples for the test.

I'd be happy to as well (via linux) for 15/3 speeds

Edit: just tell me what to do to recreate your scenario

Thanks appreciate it! I've been doing the following:

as root: tcpdump -i em0 -w speed.pcap host 204.152.184.73
as user: wget »ftp://freebsd.isc.org/pub/FreeBSD/ISO-···vefs.iso

Then I open up speed.pcap in wireshark, then click the Statistics menu and then IO graph (thanks espaeth See Profile for the info on IO graph, it's much better than the tcp throughput graph).

From there, to get those 3 10s groups of images, I set:

X axis tick interval: 0.01s
X axis pixels per tick: 1
Y axis units: Bytes/tick

Then you can scroll left/right to see a zoomed in view of the traffic. In my cast right around 23.5 seconds in, speeds fall off then go into their sawtooth pattern. Your duration of PB may vary of course

Thanks for doing this!
--
"Women. Can't live with 'em, pass the beer nuts." -Norm


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

I will do it for you on Saturday. My computer has been taken over by the zombie wife hand braking Halloween movies.



pflog
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said by ropeguru:

I will do it for you on Saturday. My computer has been taken over by the zombie wife hand braking Halloween movies.

haha no worries, thanks!
--
"Women. Can't live with 'em, pass the beer nuts." -Norm


pflog
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El Dorado Hills, CA
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reply to greg925

Click for full size
beginning
Click for full size
after powerboost
And just to prove it's NOT a TCP stack thing, I used a usenet connection to throw 20 threads at a connection to see if the overall throughput would be "flat". Not in the least.
--
"Women. Can't live with 'em, pass the beer nuts." -Norm


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

Click for full size
during speedboost
Click for full size
after speedboost
Mine looks pretty awesome. ~20 seconds of speedboost, then it drops down and is solid.

Edit: test run at ~7am Saturday 10/27 - network was quiet, everyone else still sleeping

Host machine: Linux schettino.us 2.6.32-42-generic-pae #95-Ubuntu SMP Wed Jul 25 16:13:09 UTC 2012 i686 GNU/Linux

Modem: SMCD3 (uptime is 9 days, so last reboot was 18th)

Plan is "Stater" with 5 static IPs.

said by pflog:

said by JohnInSJ:

said by pflog:

ropeguru See Profile - since you said you're not seeing the erratic speeds after PB ends, would you mind collecting some data? There is a wireshark version for windows if you're not on a mac/linux/bsd box. Would you mind generating a pcap trace as I've done so I can look at it?

I can help you find a local mirror so we're comparing apples to apples for the test.

I'd be happy to as well (via linux) for 15/3 speeds

Edit: just tell me what to do to recreate your scenario

Thanks appreciate it! I've been doing the following:

as root: tcpdump -i em0 -w speed.pcap host 204.152.184.73
as user: wget »ftp://freebsd.isc.org/pub/FreeBSD/ISO-···vefs.iso

Then I open up speed.pcap in wireshark, then click the Statistics menu and then IO graph (thanks espaeth See Profile for the info on IO graph, it's much better than the tcp throughput graph).

From there, to get those 3 10s groups of images, I set:

X axis tick interval: 0.01s
X axis pixels per tick: 1
Y axis units: Bytes/tick

Then you can scroll left/right to see a zoomed in view of the traffic. In my cast right around 23.5 seconds in, speeds fall off then go into their sawtooth pattern. Your duration of PB may vary of course

Thanks for doing this!

--
My place : »www.schettino.us


pflog
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El Dorado Hills, CA
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Awesome thanks!

ComcastDJ See Profile -THAT is what the graph should look like. Please get the 27/7 plan fixed.
--
"Women. Can't live with 'em, pass the beer nuts." -Norm



pflog
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reply to ropeguru

Click for full size
windows io graph
ropeguru See Profile - I decided to plug my windows laptop (win7) directly into the SMC D3G to rule out my FreeBSD router.

I see the same erratic speeds (see attached), but what was interesting is that I did NOT see power boost from the windows laptop. Very strange...
--
"Women. Can't live with 'em, pass the beer nuts." -Norm


pflog
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El Dorado Hills, CA
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reply to greg925

ComcastDJ See Profile - not sure if you're in the northeast in the line of Sandy. If so, take care and disregard my (selfish) post.

Any updates on this by chance?
--
"Women. Can't live with 'em, pass the beer nuts." -Norm


tagreen

join:2011-02-26
Salt Lake City, UT

Click for full size
Seeing similar things here in Salt Lake. Though I get much more jitter during power boost than after. The worst is my uploads as you can see from the attached shaperprobe wireshark capture.


pflog
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join:2001-09-01
El Dorado Hills, CA
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Is this the 27/7 plan? The jitter on your downloads during PB isn't that bad, really. Yes, it's there, but at least the amplitude of it is small.

How are you graphing upload speeds? Is this capture during a shaperprobe or are you manually uploading content somewhere?
--
"Women. Can't live with 'em, pass the beer nuts." -Norm


tagreen

join:2011-02-26
Salt Lake City, UT
reply to pflog

Seeing similar things here in Salt Lake. Though I get much more jitter during power boost than after. The worst is my uploads as you can see from the attached shaperprobe wireshark capture.



pflog
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El Dorado Hills, CA
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1 edit

Click for full size
Sorry, missed the end of that sentence.

I can't even run a shaperprobe. And this is bizarre. My connection appears to "die". So I watched systat -ifstat output, and this is what it reports (emphasis mine):


em0 in 1.309 KB/s 141.435 KB/s 10.079 GB
out 7.019 MB/s 7.019 MB/s 1.405 GB


How the heck am I getting 7 MEGABYTES per second uploads? This is truly bizarre. I captured during this, going to check the IO graph now.

*edit* pcap shows 7 MB/s uploads. If only I could figure out how shaper probe is managing that. :p 50+ Mbps uploads would be sweet. Although by the looks of the pcap, it's just sending UDP packets as fast as it can, so it's not actually that much throughput through the modem I'm sure.

tagreen

join:2011-02-26
Salt Lake City, UT

Actually I didn't (intentionally) post that reply to you. Not sure how it got double posted (and without the graph the second time.) Weird. But yes it was shaperprobe results. We've been having power issues due to snow lately, so I've not had time to retest since you said they came out with a new config. I'll rerun the tests and post the results (perhaps in the new 27/7 thread.)