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Help! Slow Comcast!


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Ok I'm out of ideas.  I have Comcast's upgraded 6mbit service.  The third comcast tech guy just left here telling me my connection was fine, and there wasn't anything else they could do.  My speeds average between 3.5-4.5 download.  Below is a typical result.  Before this problem started I was getting 5.8-6.0 every time.  When the problem first started I was getting really poor latency and about 2% packet loss.  Now I no longer have the packet loss problem, but latency is very inconsistent.  Pinging yahoo and google can vary from low 30ms to 120ms at any given time.  My upload speed is pretty near what it is supposed to be.  The tech guy said my DOCSIS or whatever that is was -2.  He said that was as near perfect as it gets.  I use Windows XP SP2 and have tried both the default settings and the suggested 6000/768 settings with Cablenut. Nothing seems to help.  Any advice would be GREATLY appreciated!  Thanks in advance!

:::.. Download Stats ..:::

Connection is:: 4216 Kbps about 4.2 Mbps (tested with 2992 kB)

Download Speed is:: 515 kB/s

Tested From:: http://www.testmy.net/

Test Time:: Fri Mar 25 2005 14:58:40 GMT-0600 (Central Standard Time)

Bottom Line:: 75X faster than 56K 1MB download in 1.99 sec

Diagnosis: Awesome! 20% + : 30.73 % faster than the average for host (comcast.net)

Validation Link:: https://testmy.net/stats/id-MI9KU5RZ0

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Microsoft Windows XP [Version 5.1.2600]

© Copyright 1985-2001 Microsoft Corp.

C:Documents and SettingsDittoz>pathping testmy.net

Tracing route to testmy.net [67.19.36.6]

over a maximum of 30 hops:

  0  DITTOZ.rthfrd01.tn.comcast.net [68.52.100.177]

  1    *        *        *

Computing statistics for 25 seconds...

            Source to Here  This Node/Link

Hop  RTT    Lost/Sent = Pct  Lost/Sent = Pct  Address

  0                                          DITTOZ.rthfrd01.tn.comcast.net [68.

52.100.177]

                              100/ 100 =100%  |

  1  ---    100/ 100 =100%    0/ 100 =  0%  CHRIS [0.0.0.0]

Trace complete.

C:Documents and SettingsDittoz>

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Also I just ran this test, and it said I had a Duplex mismatch condition.  What is that and how do I fix it?

TCP/Web100 Network Diagnostic Tool v5.3.3d

click START to begin

Checking for Middleboxes . . . . . . . . . . . . . . . . . .  Done

running 10s outbound test (client to server) . . . . . 795.79Kb/s

running 10s inbound test (server to client) . . . . . . 3.46Mb/s

Your PC is connected to a Cable/DSL modem

Alarm: Duplex mismatch condition exists: Host set to Full and Switch set to Half duplex

click START to re-test

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Sorry...meant to post the details of that test.  Here they are.

WEB100 Kernel Variables:

Client: localhost/127.0.0.1

AckPktsIn: 440

AckPktsOut: 0

BytesRetrans: 42340

CongAvoid: 130

CongestionOverCount: 0

CongestionSignals: 1

CountRTT: 249

CurCwnd: 65700

CurMSS: 1460

CurRTO: 350

CurRwinRcvd: 824320

CurRwinSent: 5840

CurSsthresh: 59860

DSACKDups: 0

DataBytesIn: 0

DataBytesOut: 4417960

DataPktsIn: 0

DataPktsOut: 3026

DupAcksIn: 181

ECNEnabled: 0

FastRetran: 1

MaxCwnd: 119720

MaxMSS: 1460

MaxRTO: 450

MaxRTT: 240

MaxRwinRcvd: 824320

MaxRwinSent: 5840

MaxSsthresh: 59860

MinMSS: 1460

MinRTO: 300

MinRTT: 90

MinRwinRcvd: 51520

MinRwinSent: 5840

NagleEnabled: 1

OtherReductions: 0

PktsIn: 440

PktsOut: 3026

PktsRetrans: 29

X_Rcvbuf: 103424

RcvWinScale: 7

SACKEnabled: 3

SACKsRcvd: 72

SendStall: 0

SlowStart: 119

SampleRTT: 100

SmoothedRTT: 120

X_Sndbuf: 103424

SndWinScale: 4

SndLimTimeRwin: 0

SndLimTimeCwnd: 10061684

SndLimTimeSender: 2789

SndLimTransRwin: 0

SndLimTransCwnd: 1

SndLimTransSender: 1

SndLimBytesRwin: 0

SndLimBytesCwnd: 4417960

SndLimBytesSender: 0

SubsequentTimeouts: 0

SumRTT: 29440

Timeouts: 0

TimestampsEnabled: 0

WinScaleRcvd: 4

WinScaleSent: 7

DupAcksOut: 0

StartTimeUsec: 884266

Duration: 10070022

c2sData: 2

c2sAck: 2

s2cData: 8

s2cAck: 4

half_duplex: 0

link: 100

congestion: 0

bad_cable: 0

mismatch: 1

spd: 0.00

bw: 5.18

loss: 0.000330469

avgrtt: 118.23

waitsec: 0.00

timesec: 10.00

order: 0.4114

rwintime: 0.0000

sendtime: 0.0003

cwndtime: 0.9997

rwin: 6.2891

swin: 64.0000

cwin: 0.9134

rttsec: 0.118233

Sndbuf: 8388608

aspd: 5.31178

Checking for mismatch on uplink

(speed > 50 [0>50], (xmitspeed < 5) [0.78<5]

(rwintime > .9) [0>.9], (loss < .01) [3.30<.01]

Checking for excessive errors condition

(loss/sec > .15) [3.30>.15], (cwndtime > .6) [0.99>.6],

(loss < .01) [3.30<.01], (MaxSsthresh > 0) [59860>0]

Checking for 10 Mbps link

(speed < 9.5) [0<9.5], (speed > 3.0) [0>3.0]

(xmitspeed < 9.5) [0.78<9.5] (loss < .01) [3.30<.01], (mylink > 0) [3.0>0]

Checking for Wireless link

(sendtime = 0) [3.0E=0], (speed < 5) [0<5]

(Estimate > 50 [5.18>50], (Rwintime > 90) [0>.90]

(RwinTrans/CwndTrans = 1) [0/1=1], (mylink > 0) [3.0>0]

Checking for DSL/Cable Modem link

(speed < 2) [0<2], (SndLimTransSender = 0) [1=0]

(SendTime = 0) [3.0E-4=0], (mylink > 0) [3.0>0]

Checking for half-duplex condition

(rwintime > .95) [0>.95], (RwinTrans/sec > 30) [0>30],

(SenderTrans/sec > 30) [0.1>30], OR (mylink <= 10) [3.0<=10]

Checking for congestion

(cwndtime > .02) [0.99>.02], (mismatch = 0) [1=0]

(MaxSsthresh > 0) [59860>0]

estimate = 5.18 based on packet size = 11Kbits, RTT = 118.23msec, and loss = 3.30469E-4

The theoretical network limit is 5.18 Mbps

The NDT server has a 8192.0 KByte buffer which limits the throughput to 541.30 Mbps

Your PC/Workstation has a 805.0 KByte buffer which limits the throughput to 53.19 Mbps

The network based flow control limits the throughput to 7.72 Mbps

Client Data reports link is 'T1', Client Acks report link is 'T1'

Server Data reports link is 'OC-48', Server Acks report link is 'T3'

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Changed my Ethernet cable and power cycled my modem.  No change.  I've had 4 tech's out here from Comcast.  Their supervisor knows me on a first name basis.  Unfortunately, they say there's nothing they can do for me.  They say my signal is great and don't understand why I'm having a problem.  And I have no idea either.  Like I said, it worked fine for about a month after the upgrade, and then bam.  Sucky speeds.  But thanks for your help.  I appreciate it. 

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I'm in the Nash . . . but I'm not holding my breath

go ahead and recontact support - should be in 5's if you indeed have upgrade.  support can receive up and down stats, if not whre should be ask for credit, once u get above level 3 support u should get someone more intelligent to discuss issue with.

DON"T GIVE UP - they thrive on those that let it go . . .

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Well the Comcast Tech just left.  He was very helpful, climbed through the attic.  Looked at my connection.  Replaced all my cable lines.  Couldn't find anything wrong at all.  Said my signal was fine.  But I'm still getting horrible speeds and some packet loss.  He saw it, and said "Man, that just isn't right".  He told me he was going to call his supervisor and tell him that I've got problems but he can't figure out what it is. 

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