Topic '[speed/latency] 500bps vs 250kbs (win/*inux)' in forum 'Verizon Online DSL' - dslreports.com

Re: [speed/latency] 500bps vs 250kbs (win/*inux)

Tue, 07 Jul 2009 00:50:30 EDT

Jodokast96 posted : One thing that is probably an issue is in your Line Quality Test. The second to last hop has an ERX designation, which means it's a Juniper router. They do not work well when RWIN's are set to recommended values. On XP and earlier, this is not a problem, as you can change the RWIN. On Vista and 7, that's not possible, and the auto-tune function does not get it right here. The most notable thing you will see are slower and inconsistent speeds to servers closest to you. Speed and consistency will improve as you move further away.

Re: [speed/latency] 500bps vs 250kbs (win/*inux)

Mon, 06 Jul 2009 22:40:37 EDT

npc posted : Thank you for your responses, while it still doesn't feel like its living up to what the speed test suggest; I have a connection that is 'functional'. Though how the modem/router recovered isn't clear not exactly certain. I will be comparing the current settings to the previous.

»/testhistory/1656425/08ba4
(you'll note the 4kbps download speed, when I attempted to post earlier today (7-8 hours ago) with the first halve of the results.)

Thank you for tschmidt,
with the speedtests from »speedtest.net and »/speedtest they yield drastically different results though I am inclined to trust dslreports, based primarily on that images above 70kb "timeout?" ...
(Verizon's speedtest »www2.verizon.net/micro/speedtest/hsi/ decent speeds, yesterday, today it shows NaN.)

Browser: Opera
Site: speedtest.net

Download  2.32 Mb/s
Upload    0.72 Mb/s
Ping        34 ms
ISP:      Verizon Internet Services
Distance: ~ 50 mi

Download  2.37 Mb/s
Upload    0.64 Mb/s
Ping        35 ms
ISP:      Verizon Internet Services
Distance: ~ 150 mi

cache cleared / Browser: iexplore

Speedtest.net
Download  2.32 Mb/s
Upload    0.72 Mb/s
Ping        25 ms
ISP:      Verizon Internet Services
Distance: ~ 50 mi

~~-----------------------------~~
dslreports.com/speedtest
(withing 100 miles of test site)

ping 28, down 1kbs, up 697kbs

13 minutes later

ping 24, down 10 kbs

Thank you,
NPC ...

Line test in progress, »[speed/latency] Major slowdown and high pings , I suppose it might be important to not my location just west of reading, pa. (near RadioTek.) The test is interesting to watch in win7's resource monitor. Looks like I passed that test... though I'm curious what would have happened earlier at 4kbs. Smith6612, you might be right, it may be a part of pandemic.

Jodokast96
Windows machines perform better than the others?
I find that difficult to determine. Two computers, Win7 and XpSp2 are the two main computers. They seem to work well within the LAN, but on their native windows they crawled today. The OS's are matched to the machine specs, so I don't think they are on an even field. The only drastic difference was booting to a live cd.

.. aside, I believe the problem was/is router, modem, and higher because all machines exhibit similar symptoms.
Why backtrack4beta and ubuntu didn't follow the same path intrigues me, prehaps its the auto tune feature. I must admit that with ubuntu, it just works, and backtrack... I'm typing in a chant that I'm still leaning about: '/etc/init.d/networking start' for eth0

niblifar thank you for the links they have been downloaded for consummation.

Thank you BBR members.
NPC

Re: [speed/latency] 500bps vs 250kbs (win/*inux)

Mon, 06 Jul 2009 22:22:54 EDT

Smith6612 posted : I didn't know that. Thanks for giving me that info :)

Re: [speed/latency] 500bps vs 250kbs (win/*inux)

Mon, 06 Jul 2009 20:15:13 EDT

niblifar posted :

said by Smith6612:

The last I checked, the recent versions of Linux don't have auto-tuning capabilities like Vista or Windows 7 do, but instead are like Windows XP and older, where you can adjust the MTU and Receive Window by using the Terminal/Console + sudo

That is incorrect. Linux has had auto-tuning capabilities for a while now.

See
»www.kernelfaq.com/2007/11/tcp-au···ing.html
»www.psc.edu/networking/projects/···e/#Linux
--
Vita est bona.

Re: [speed/latency] 500bps vs 250kbs (win/*inux)

Mon, 06 Jul 2009 19:19:20 EDT

Smith6612 posted : I haven't seen many differences between Linux distros here besides their speeds, but when it comes down to it, I'm running them on machines 256/512MB of RAM so they run quite slow as it is. The last I checked, the recent versions of Linux don't have auto-tuning capabilities like Vista or Windows 7 do, but instead are like Windows XP and older, where you can adjust the MTU and Receive Window by using the Terminal/Console + sudo
--
It's all fun and games in a Team Fortress 2 battle until your sentry gun is sapped by the Spycrab!

Re: [speed/latency] 500bps vs 250kbs (win/*inux)

Mon, 06 Jul 2009 16:36:32 EDT

Jodokast96 posted : In addition to the tests Tom suggested, do any of the Windows machines perform better than the others? Starting with Vista, Windows went with auto-tuning tcp connections, so there are very few options for correcting any potential issues. Older versions allow you to tweak things a bit more. I know you are asking a bit more, but I haven't used anything Linux enough to know how they are different, but do know why Windows systems sometimes suck.

Re: [speed/latency] 500bps vs 250kbs (win/*inux)

Mon, 06 Jul 2009 10:14:53 EDT

tschmidt posted : Welcome to BBR.

It can be very difficult to pin down file transfer issues because it is and end-to-end issue. Anything between you and remote server can impact speed.

DSL stats look good, be nice if download was a little higher then 8 dB but modem is able to sync at correct speed.

Next step is to run speed tests. These tests transfer data to servers with lots of capacity.
»/tools
»speedtest.net/

Pick a server near your location. Speed is affected by distance and hop count.

Might also want to run the tweak test located on the Tools page.

Keep in mind speed test result will be lower then modem sync rate due to various forms of communication overhead (TCP/IP, PPPoE, and ATM). Best case is about 85% of sync rate. I have the same plan and get about 2875/725 on speed tests.

If speed test is OK most likely a limitation on server.

/tom

Re: [speed/latency] 500bps vs 250kbs (win/*inux)

Mon, 06 Jul 2009 09:37:16 EDT

npc posted : Thank you for your response Jodokast98,

Even the Windows systems vary a bit. Which version of Windows specifically?

- Jodokast96

"(2k, xp (sp2, sp3), vista, win7 beta?"

spread over three desktops, and two laptops. (I can gather system specs but all were connectible previously with little difficulty.)

This laptop runs Windows 7 RC, with a swappable hard disk still running Windows 7 beta (haven't had time to extract and burn the files yet, that two hour before reboot period was suppose to start earlier this month.) Ubuntu 9.04 and backtrack 4 beta I keep in my bag in case anything happens to the hard disk while on the road. But are run as live-cds.

On two of the desktops:
Windows Vista Ultimate
Windows XP Pro sp3 (does not have a wireless nic)

On the remaining desktop and old laptop run:
Windows Xp Home sp 2
Windows 2000 Pro (does not have a wireless nic)
Only these two computers, I do not have full control, but the xp home sp2 is probably the most critical. The win2k had an infection but its been neutered (and hasn't been connected save in isolated troubleshooting and experimentation.)

Before the system went south, there were three other laptops connecting, though I no longer have access. (a macbook and two xp home machines.) They've been returned to there cyber-school for retooling in this coming year, but these machines were not involved in the recent troubleshooting.

Of the machines listed I've attempted isolated connections through ethernet cable to all, and wireless (with mac addressed filtering on a permit list at the router. (linksys wrt54gs firmware v7.2.06)

The win7 rc laptop and the xp home sp2 pc have spent the most time connected. (at times directly into the westell 6100 modem this one is ver 4.04.03.00; I think the alternate westell 6100 has a different firmware.)

I agree the connection process with each os is unique. I like the information and presentation that win7 gives, but it occasionally hiccups on hotel wifi. But xp seems to be simpler to connect.

Thank You for your interest and taking the time to respond.
NPC

Addendum in case it gets lost in the noise, primarily win xp home sp2 and win 7 rc.

Re: [speed/latency] 500bps vs 250kbs (win/*inux)

Mon, 06 Jul 2009 08:36:01 EDT

Jodokast96 posted : Even the Windows systems vary a bit. Which version of Windows specifically?

[speed/latency] 500bps vs 250kbs (win/*inux)

Mon, 06 Jul 2009 01:49:16 EDT

npc posted : to the members of dslreports:
I would be grateful for your collective wisdom and direction.

While I am having a similar problem to what sandman2 describes in a recent post. My download speeds remain erratic, though generally in the abnormal and slow categories.

My question, how do linux live-cd distributions such as ubuntu 9.04 and backtrack 4 beta (slax based) vary from windows operating systems (2k, xp (sp2, sp3), vista, win7 beta? (While barely familiar with the operating systems I find curious the robust or vigor of their connection. I do not desire to be flame bait, but recognize the anomaly that may hold answers.)

Several weeks ago my dsl connection started acting up, though at the time swapping the modem out and later reconfiguring the router seemed to alleviate the crashes.

So far, I've isolated the dsl line to the modem. (Found one phone jack out of polarity as well but doesn't appear to affect the connection once resolved.) Reset both the router and the router (linksys wrt54gs) [which did give a short lived speed boast], disabled wireless connections, and bypassed the router entirely.

This week download speed has reached an unbearable low. While attempting to grab a topo map, of 6187kb, from usgs.gov download speeds started around 500 bytes and peeked at 1.3, 1.4 kilobytes per second. Web pages are hesitant to load at those speeds.
But other than brief boast after reset, linux live-cd's distributions have been the only thing to restore a connection close to 280kb download. The same topos that I attempted to download earlier came down at 180-230 kbs. (while I am muddle through the learning process of new operating systems, I doubt it is the proper solution.)

What direction should I pursue in resolving this? any suggestions would be greatly appreciated.

Westell 6100 indicates:

Transceiver Statistics
Transceiver Revision: 7.2.3.0
Vendor ID Code: 4
Line Mode: G.DMT Mode
Data Path: Fast
 
Transceiver Information: Downstream Path, Upstream Path
. DSL Speed (Kbits/Sec): 3360, 864
.           Margin (dB): 16.5, 8.0
. Line Attenuation (dB): 38.5, 24.0
.  Transmit Power (dBm): 14.4, 11.8

Thank You, NPC