 pflogBueller? Bueller?Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3 | reply to ComcastDJ
Re: [Speed] Comcast Business Class Speed Upgraded in California 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 |
|
|
|
| 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? |
|
pflogBueller? Bueller?Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3 | 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 |
|
pflogBueller? Bueller?Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3 | 
0-10 seconds | 
10-20 seconds | 
20-30 seconds |
--
"Women. Can't live with 'em, pass the beer nuts." -Norm |
|
| Got ya. Is this causing issues for something you are doing on this connection?
Thank you.
DJ |
|
pflogBueller? Bueller?Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3 | 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 |
|
pflogBueller? Bueller?Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3 | reply to ropeguru
ropeguru  - 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 |
|
 JohnInSJPremium
join:2003-09-22
San Jose, CA
 ·PHONE POWER
 ·Comcast
| said by pflog: ropeguru - 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 |
|
pflogBueller? Bueller?Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3 | said by JohnInSJ:said by pflog: ropeguru - 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 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 |
|
 ropeguruPremium
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. |
|
pflogBueller? Bueller?Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3 | 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 |
|
pflogBueller? Bueller?Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3 | reply to greg925
beginning | 
after powerboost |
--
"Women. Can't live with 'em, pass the beer nuts." -Norm |
|
JohnInSJPremium
join:2003-09-22
San Jose, CA Reviews:
·PHONE POWER
·Comcast
| reply to pflog
during speedboost | 
after speedboost |
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 - 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.isoThen I open up speed.pcap in wireshark, then click the Statistics menu and then IO graph (thanks espaeth 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 |
|
pflogBueller? Bueller?Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3 | Awesome thanks!
ComcastDJ -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 |
|
pflogBueller? Bueller?Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3 | reply to ropeguru
windows io graph |
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 |
|
pflogBueller? Bueller?Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3 | reply to greg925
ComcastDJ - 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 | 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. |
|
pflogBueller? Bueller?Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3 | 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. |
|
pflogBueller? Bueller?Premium,MVM
join:2001-09-01
El Dorado Hills, CA
kudos:3
1 edit | 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. |
|
