"Re-Testing" ~ Need Help in Tweaking?

ROM-DOS · October 16, 2005

I'm "Testing" new settings in my Registry and with CableNut Adjuster.

First, I re-set my MSS to 1432 and my MTU to 1472.

reason: I start to experience packet fragmentation after 1472.

E:>ping -f -l 1472 64.40.40.51 <~ my ISP

Pinging 64.40.40.51 with 1472 bytes of data:

Reply from 64.40.40.51: bytes=1472 time=147ms TTL=62

Reply from 64.40.40.51: bytes=1472 time=171ms TTL=62

Reply from 64.40.40.51: bytes=1472 time=172ms TTL=62

Reply from 64.40.40.51: bytes=1472 time=171ms TTL=62

Ping statistics for 64.40.40.51:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 147ms, Maximum = 172ms, Average = 165ms

E:>ping -f -l 1472 64.40.40.51

Pinging 64.40.40.51 with 1472 bytes of data:

Reply from 64.40.40.51: bytes=1472 time=147ms TTL=62

Reply from 64.40.40.51: bytes=1472 time=171ms TTL=62

Reply from 64.40.40.51: bytes=1472 time=172ms TTL=62

Reply from 64.40.40.51: bytes=1472 time=171ms TTL=62

Ping statistics for 64.40.40.51:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 147ms, Maximum = 172ms, Average = 165ms

Then I made these 'Adjustments' to my CableNut settings.

(see attachment)

. . .any advise on what I've done? or comments about trying diferent settings.

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

Connection is:: 47 Kbps about 0 Mbps (tested with 97 kB)

Download Speed is:: 6 kB/s

Tested From:: https://testmy.net/ (server2)

Test Time:: Sun Oct 16 10:44:32 PDT 2005

Bottom Line:: 1X faster than 56K 1MB download in 170.67 sec

Diagnosis: May need help : running at only 60.26 % of your hosts average (nocharge.com)

Validation Link:: https://testmy.net/stats/id-YLPTWNGF8

My goal in all this is to 'optimize' my settings for 'on-line' gaming

(ie. lag issues and staying connected)

cholla · October 17, 2005

ROM_DOS; To start with now that you have set your MTU to 1472 & your MSS to 1432

try ping I beleive you will no longer be able to ping at 1472.I beleive you will ping

without fragmenting at 1472 - 28.

I'm not sure what you are basing your Receive window settings on I would go back to 1500

on the MTU &1460 on the MSS.then using an even multiple of MSS but staying small try 8760

for the DefaultReceiveWindow,GlobalMaxTcpReceiveWindow,&TcpWindowSize.I like 11680 better for mine but the 8760 will probably give a lower ping.

Setting TcpMaxDupAcks to 2 & lowering DefaultTTL to 64.

I was looking at the recomended cablenut settings for a 56K It seems they base the RWIN & Send window on 1024 this doesn't seem correct for a MTU1500 &MSS 1460.

So I think the DefaultSendWindow should be 5840,

LargeBufferSize=58400.MediumBufferSize=20480,SmallBufferSize=1460.

These are all based on a MSS of 1460.If MSS is not the right base

to use then everything should be base on 1024 for packet size based

settings.

I don't know about this setting MaxHashTableSize in yours it is 65536

the recomended shows it matched to the DefaultSendWindow if you use the

one I suggested 5840 then MaxHashTableSize = 5840 .

ROM-DOS · October 17, 2005

. . . for the DUKE ; O-Tay, I changed everything back to what you suggested.

except; GlobalMaxTcpWindowSize = 11680 and MaxHashTableSize = 65536

MaxHashTableSize: Default: 512 (must be a power of 2)

Valid Range: 0x40

cholla · October 17, 2005

ROM-DOS : A small increase in speed but how did the ping & lag perform?

With the MTU at 1472 did you get "packet needs to be fragmented but DF set" until you changed the MTU back to 1500 & the MSS back to 1460?

ROM-DOS · October 17, 2005

I can't ping anything beyond my ISP(NoCharge.com 64.40.40.51)

E:>ping -f -l 1500 64.40.40.51

Pinging 64.40.40.51 with 1500 bytes of data:

Packet needs to be fragmented but DF set.

Ping statistics for 64.40.40.51:

Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

E:>ping -f -l 1460 64.40.40.51

Pinging 64.40.40.51 with 1460 bytes of data:

Reply from 64.40.40.51: bytes=1460 time=165ms TTL=62

Reply from 64.40.40.51: bytes=1460 time=171ms TTL=62

Ping statistics for 64.40.40.51:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 165ms, Maximum = 171ms, Average = 169ms

. . .I'm staying connected ~ lol /my status = yellow

(status indicators [on-line/in-game] = green, yellow and red)

my FPS(Frames Per Second) are in the 20's.

I'm choosing servers with less than ten players - in COOP mode - ie, enemys are AI's

. . . the AI's are alot smarter than facing 'live' opponents ~ lol

~

ROM-DOS · October 18, 2005

Questions:

If I start experiencing fragmentation above 1472

shouldn't my MTU be 1472?

and my MSS(MTU - 40) be 1432?

and when calculating my TcpReceiveWindow

1472(MTU) x 300(Max Anticipated Latency) / 8 = 55200

55200 / 1432 = 38.54786 (Then round up to the nearest even whole number:)

40 x 1432 = 57280 = the base TcpReceiveWindow value

from here I could take advantage of Windows Scaling

(if the value is 65535 or greater)

57280 x 2 = 114560 = MAX TcpReceiveWindow

referencing: http://www.broadbandnuts.com/index.php?page=tiptrix

DefaultReceiveWindow = multiply your ISPs download caps in kilobytes by 1024

DefaultSendWindow = multiply your ISPs upload caps in kilobytes by 1024

DefaultReceiveWindow = 56 x 1024 = 57344

DefaultSendWindow = 26 x 1024 = 26624

Shouldn't this be how I should be thinking ~ when re-testing my settings?

cholla · October 18, 2005

ROM-DOS ; On the first question when you use ping -f -l to find your MTU you add 28 to the result for the headers.I don't have a link handy for this but this is correct so 1472+28=1500.

1500-40=1460.The formulas for TcpReceiveWindow,DefaultReceiveWindow ,&

cholla · October 18, 2005

ROM-DOS: I'm going to do some calculations for you.Based on this & some of your amounts in your post.

Proper TcpReceiveWindow Formula:

(Maxium Bandwidth x Maxium Anticipated Latency) / 8

Example of a Cable connection with a 1500 download cap with an Anticipated Latency of 100 ms:

(1500 x 100) / 8 = 18750 To make it a multipule of MSS divide by 1460:

18750 / 1460 = 12.84246 Then round up to the nearest even whole number:

14 x 1460 = 20440

56 x 300=16800;

ROM-DOS · October 20, 2005

D.U.K.E. Cholla ; (Dial Up Knowledge Expert)

I set my settings per PM on smaller settings and I'm staying connected,

sometimes in the 'green' ~ lol

Here's the settings I'm using; (let me know if I got them right)

56k on-line game settings;

DefaultReceiveWindow = 2144

DefaultSendWindow = 2144

DisableAddressSharing = 1

InitialLargeBufferCount = 20

InitialMediumBufferCount = 48

InitialSmallBufferCount = 64

LargeBufferSize = 21440

MaxFastTransmit = 6400

MediumBufferSize = 5360

Priority Boost = 0

SmallBufferSize = 536

TransmitWorker = 32

FastSendDatagramThreshhold = 1024

EnableFastRouteLookup = 1

EnablePMTUDiscovery = 1

IgnorePushBitsOnReceives = 0

GlobalMaxTcpWindowSize = 2144

MaxFreeTcbs = 2000

MaxHashTableSize = 2144

MaxNormLookupMemory = 5000000

SackOpts = 1

SynAttackProtect = 1

Tcp1323Opts = 0

TcpLogLevel = 1

TcpMaxDupAttacks = 2

TcpMaxHalfOpen = 100

TcpMaxHalfOpenRetired = 80

TcpRecvSegmentSize = 536

TcpSendSegmentSize = 536

TcpTimedWaitDelay = 30

TcpUseRFC1122UrgentPointer = 0

TcpWindowSize = 2144

MaxConnectionsPer1_0Server = 8

MaxConnectionsPerServer = 4

DefaultTimeToLive = 128

DefaultUserTOSSetting = 0

TcpMaxDataRetransmissions = 6

DefaultTOSValue = 240

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

Connection is:: 39 Kbps about 0 Mbps (tested with 97 kB)

Download Speed is:: 5 kB/s

Tested From:: https://testmy.net/ (server2)

Test Time:: Thu Oct 20 13:32:54 PDT 2005

Bottom Line:: 1X faster than 56K 1MB download in 204.8 sec

Diagnosis: May need help : running at only 51.32 % of your hosts average (nocharge.com)

Validation Link:: https://testmy.net/stats/id-RPM9GEYFX

:::.. Upload Stats ..:::

Connection is:: 22 Kbps about 0 Mbps (tested with 97 kB)

Upload Speed is:: 3 kB/s

Tested From:: https://testmy.net/ (server1)

Test Time:: Thu Oct 20 13:35:08 PDT 2005

Bottom Line:: 0X faster than 56K 1MB upload in 341.33 sec

Diagnosis: Looks Great : 15.79 % faster than the average for host (nocharge.com)

Validation Link:: https://testmy.net/stats/id-5ICH8S1K9

cholla · October 20, 2005

ROM-DOS : Those are the ones I did for the 576 MTU & 536MSS How did they do when you play the gane is the latency & lag better?

The other lower ones were based on 1500 MTU & 1460 MSS.

I still haven't had time to do some research on the AFD & how the 1024 is supposed to work as

its base.

ROM-DOS · October 20, 2005

D.U.K.E. Cholla ; (Dial Up Knowledge Expert)

these settings are working fine ~ at least no dis-connects ~ lol

lag could also have to do with my video card ~ NVIDIA GeForce FX 5200

though, I do have all my in-game video settings on 'low'.

[move] [move] ~[/move] No compression [move]~[/move][/move]

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

Connection is:: 48 Kbps about 0 Mbps (tested with 97 kB)

Download Speed is:: 6 kB/s

Tested From:: https://testmy.net/ (server2)

Test Time:: Thu Oct 20 23:59:04 PDT 2005

Bottom Line:: 1X faster than 56K 1MB download in 170.67 sec

Diagnosis: May need help : running at only 62.34 % of your hosts average (nocharge.com)

Validation Link:: https://testmy.net/stats/id-2PJNACI86

cholla · October 21, 2005

ROM-DOS: I've been looking into the AFD as it applies to the DefaultReceiveWindow,DefaultSendWindow

ROM-DOS · October 21, 2005

D.U.K.E. Cholla ; (Dial Up Knowledge Expert)

I changed my settings to match your 'smaller' settings.

. . .but, now I'm confused(?) about the DefaultReceiveWindow and DefaultSendWindow.

later you say;

To set the default size of the AFD-Windows use the following DWORD registry keys :

[HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services Afd Parameters]

DefaultReceiveWindow = 16384

DefaultSendWindow = 16384

In my CableNut Adjuster Settings ~ it changes the Registry settings in AFD and Tcpip for XP.

. . .what should my Default Receive and Send Windows be then?

cholla · October 21, 2005

ROM-DOS ; Sorry I didn't mean to confuse you The following was an example of it being a multiple of 4096(page size).4096 is a multiple of 1024.I used 1024 to calculate the smaller DefaultReceiveWindow &DefaultSendWindow I put in the list for the gaming settings.

To set the default size of the AFD-Windows use the following DWORD registry keys :

[HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services Afd Parameters]

DefaultReceiveWindow = 16384(Example)

DefaultSendWindow = 16384(Example)

So yours should be this for the gaming settings:

DefaultReceiveWindow 2042

DefaultSendWindow 2042

On your C: drive these settings should also be even multiples of 1024 or 4096(page size)

DefaultReceiveWindow,DefaultSendWindow , LargeBufferSize,MediumBufferSize,& SmallBufferSize in Cablenut's settings.These are all based on AFD so they are even multiples of 1024 or 4096 .

These 2 are based on MTU &MSS so they should be an even multiple of MSS.

TcpWindowSize & GlobalMaxTcpWindowSize

ROM-DOS · October 22, 2005

Like how you changed your name

ROM-DOS · October 24, 2005

Cleared my CableNut Adjuster settings; except I dis-abled (set to 0) EnablePMTUDiscovery

and went to SpeedGuide.net and got this;

MTU = 1500

MTU is fully optimized for broadband.

MSS = 1460

Maximum useful data in each packet = 1460, which equals MSS.

Default Receive Window (RWIN) = 8760

RWIN Scaling (RFC1323) = 0 bits

Unscaled Receive Window = 8760

needless to say ~ I couldn't stay connected in on-line game.

so, I'm going to try a previous(good/small) CableNut setting and see what happens.

I'm connected at 52Kbps right now, I'll click over and do a download test.

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

Connection is:: 50 Kbps about 0 Mbps (tested with 97 kB)

Download Speed is:: 6 kB/s

Tested From:: https://testmy.net/ (server2)

Test Time:: Mon Oct 24 15:48:19 PDT 2005

Bottom Line:: 1X faster than 56K 1MB download in 170.67 sec

Diagnosis: May need help : running at only 65.79 % of your hosts average (nocharge.com)

Validation Link:: https://testmy.net/stats/id-F6AXBHJYV

cholla · October 24, 2005

ROM-DOS : What does your cablenut show when you select " Retreive current registry values"?

Can you use find in your registry to find all the MTU & MSS settings?

With the new registry program you are using is the old registry gone?

If not could some of its settings be effecting your MTU &MSS?

ROM-DOS · October 25, 2005

re-set my CableNut Adjuster settings, again.

. . .and staying connected in-game/on-line(with up to 64 players in server!)

It actually stays connected better with more players in the game server...

New Settings for feedback;

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"Re-Testing" ~ Need Help in Tweaking?

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