OS and Software > Broadband Tweaks > [DSL] DRTCP021, Tcp Receive Window Settings do not "take"/sa

[DSL] DRTCP021, Tcp Receive Window Settings do not "take"/sa

What OS are you running?

DrTCP is compatible with Windows 2000 & XP, But it will NOT work with Windows VISTA.

-Tursiops_G.
--
If You're Unsure, "RTFM"... If You're SURE, "RTFM" Anyway.

Hello,

It is XP.

By the way, what is RTFM?

Be sure to select your Ethernet NIC card in the 'Adapter Settings' Dropdown dialog in DrTCP before entering any changes, then hit 'Apply', then 'Exit'... Then Reboot the PC.

»Tweaking FAQ »DRTCP: How do I use it and what are all these settings?

If you have already done that, What specific changes didn't seem to "Take"?

("RTFM" = "Read The F[ine] Manual")...

-Tursiops_G.
--
If You're Unsure, "RTFM"... If You're SURE, "RTFM" Anyway.

Yes, DrTCP is reporting "SAVED" after saving the settings, and I'd rebooted the OS. (I'm trying to lower the RWIN setting to between 14520 and 37752 (something advised on the results page of the "Tweaking for speed" function.)

I've done the changes described above for Tcp Receive Window Settings (TRYING TO lower THE 'RWIN Settings' before choosing both 'Adapter Settings.'

There are two 'Adapter Settings': a. "1394 Net Adapter;"
and b. Realtek 8139/810x Family Fast Ethernet NIC."

I'll try again to lower RWIN to 14520 for only the 'Realtek 8139/810x Family Fast Ethernet NIC.'

Tcp Receive Window Settings do not "take"

+++ I'd just repeated the steps for '...Family Fast Ethernet NIC." Nothing.
The results of the last test are:

"1. Your Tweakable Settings
Receive Window (RWIN): 65535 •
Window Scaling: off
Path MTU Discovery: ON
RFC1323 Window Scaling: OFF
RFC1323 Time Stamping: OFF
Selective Acks: ON
MSS requested: 1452
TTL:
(less any hops behind firewall)
130
TTL remaining: 114
TOS flags: none set"

Where can I read the "Fine Manual?" (I've never heard of it.)

Also, a couple of years ago, another expert successfully advised me to edit some log file with a command line command beginning with SOMEthing like "rtsh....." but i cannot find the precise text that worked then.

What TCP RWIN setting are you trying to set, and what setting is DrTCP reporting after saving the settings and Rebooting?

(Edit): If you are attempting to set your RWIN to a value larger than 65535, then you will also have to change the 'Window Scaling' dropdown selection in DrTCP to 'YES'.

-Tursiops_G.
--
If You're Unsure, "RTFM"... If You're SURE, "RTFM" Anyway.

I'm trying to lower the RWIN setting to between 14520 and 37752 (something advised on the results page of the "Tweaking for speed" function).
P.S. Thank you so much for trying to help me. I really appreciate it and respect your day job a great deal.

reply to meteo2
Can you run a tweak test at »/tweaks and post the URL of the results page here.

What service do you have and what advertised speeds are you supposed to get? No need to lower under 65k nowadays. You should be fine with the XP default anyway.
--
Tweaked your connection? | Mail Parse | Speed Converter

Tweak Tester Result
We have collected information from your trial download and upload.
Service:
Download Speed kbit/s:
(the download speed advertised for your line)
Operating System:
Connection:

1. Your Tweakable Settings
Receive Window (RWIN): 65535
Window Scaling: off
Path MTU Discovery: ON
RFC1323 Window Scaling: OFF
RFC1323 Time Stamping: OFF
Selective Acks: ON
MSS requested: 1452
TTL:
(less any hops behind firewall)
130
TTL remaining: 114
TOS flags: none set

2. Test Download
Actual data bytes sent: 1024001
Actual data packets: 707
Max packet sent (MTU): 1492
Max packet recd (MTU): 1492
Retransmitted packets: 0
sacks you sent: 0
pushed data pkts: 32
data transmit time: 14.480 secs
our max idletime: 1038.8 ms
transfer rate: 65026 bytes/sec
transfer rate: 520 kbits/sec
transfer efficiency: 100%

3. ICMP (ping) check
Minimum ping: 43.41 ms
Maximum ping: 46.42 ms
Ping stability:
45.55 43.67 46.42 44.72 43.41 44.91 46.38 44.36 44.68 45.66
4. Notes and Recommendations Choose RWIN between 14520 and 37752 (==emphasis added) (FAQ #586)
download/use DRTCP .. (FAQ #578)
Read the tweak FAQ

Observations:
Good data stream (no/few rexmits)
1 second+ stall detected (FAQ #1606)

Observations:
Looking good"

I pay Earthlink for "1.5 Mbs", via verizon; 'used to get 1.1 - 1.2 consistently, however, since last weekend, 'have not gotten over 0.700 Mbs. except a couple of times up to 0.900 Mbs.

Further info, from: »miranda.ctd.anl.gov:7123/ :

TCP/Web100 Network Diagnostic Tool v5.5.1
click START to begin
Connected to: miranda.ctd.anl.gov -- Using IPv4 address
Checking for Middleboxes . . . . . . . . . . . . . . . . . . Done
checking for firewalls . . . . . . . . . . . . . . . . . . . Done
running 10s outbound test (client-to-server [C2S]) . . . . . 133.0kb/s
running 10s inbound test (server-to-client [S2C]) . . . . . . 525.52kb/s
Your PC is connected to a Cable/DSL modem
[S2C]: Packet queuing detected

reply to meteo2
Your tweak settings are fine and don't need to be lowered. Any issue you are having has nothing to do with your tweak settings.

What do you get at »www.speakeasy.net/speedtest/ and run the Washington DC test at various times of the day?
--
Tweaked your connection? | Mail Parse | Speed Converter

reply to meteo2

THANK YOU: Success! -- and speed is back up to between 1.1 and 1.2 Mbs. -- good enough!

The "ftp transfer rate" (»»ftp://ftp1.optonline.net/test512 ) is up from 123 Kbps. to 133 Kbps.
"Tweak Tester Result
We have collected information from your trial download and upload.
Service:
Download Speed kbit/s:
(the download speed advertised for your line)
Operating System:
Connection:

1. Your Tweakable Settings
Receive Window (RWIN): 37752 (==emphasis added)
Window Scaling: off
Path MTU Discovery: ON
RFC1323 Window Scaling: OFF
RFC1323 Time Stamping: OFF
Selective Acks: ON
MSS requested: 1452
TTL:
(less any hops behind firewall)
65
TTL remaining: 50
TOS flags: none set

2. Test Download
Actual data bytes sent: 1024001
Actual data packets: 707
Max packet sent (MTU): 1492
Max packet recd (MTU): 1492
Retransmitted packets: 0
sacks you sent: 0
pushed data pkts: 40
data transmit time: 7.691 secs
our max idletime: 482.4 ms
transfer rate: 121872 bytes/sec
transfer rate: 974 kbits/sec
transfer efficiency: 100%

3. ICMP (ping) check
Minimum ping: 41.72 ms
Maximum ping: 43.88 ms
Ping stability:
43.57 42.43 42.46 43.00 43.74 42.11 43.88 41.94 41.72 43.20
4. Notes and Recommendations RWIN is in range
Looking good

Observations:
Good data stream (no/few rexmits)

Observations:
Looking good"

There's no way that change in RWIN made any difference. Switch it back to 65535, save and reboot and retest. If you're seeing any difference, there's an issue that is causing the performance problem and lowering the RWIN is just masking it.
--
Tweaked your connection? | Mail Parse | Speed Converter

Nope, not RWIN alone, as it was changed back to 65535, with Speakeasy still reporting 1+Mbs.

Could it have been one of the other ten adjustments.

Oh..., I now realize that I reran the Manual Tweak Screen with only DefaultReceiveWindow and TcpWindowSize changed back to 65535, while GlobalMaxTcpWindowSize remained 37752.

+++ New Information: +++ Earthlink said that there was "trouble" on the line from the "central office." Last night, at one point, the speed was measured at 2. kbps -- I'll conclude that they'd been working on it, as it is back to 1.1 Mbs. now. That low speed was after I moved GlobalMaxTcpWindowSize up to 65535. It is now back to 37752 along with Default-RW and TcpW-Size.