I have yet to test this, and will test it after the servers are up again, but from what Baalzaman from Blackrock server has said, this has fixed up his latency on Blackrock by quite alot, many people on the threat on the WoW forums are saying its working and yet to see for my self. Interesting...
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To get low pings with 2 simple registry hacks do the following (you need to do both settings for the maximum effect)
1 - TcpAckFrequency - NOTE if you are running Windows Vista this setting may not have any effect - a hotfix is needed which i'm tracking down (can anyone point me the right way?). This works fine under Windows XP
Type "regedit" in windows "run.." dialog to bring up registry menu
Then find:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\
There will be multiple NIC interfaces listed in there, find the one you use to connect to the internet, there will be several interfaces listed (they have long names like {7DBA6DCA-FFE8-4002-A28F-4D2B57AE8383}. Click each one, the right one will have lots of settings in it and you will see your machines IP address listed there somewhere. Right-click in the right hand pane and add a new DWORD value, name it TcpAckFrequency, then right click the entry and click Modify and assign a value of 1.
you can change it back to 2 (default) at a later stage if it affects your other TCP application performance. it tells windows how many TCP packets to wait before sending ACK. if the value is 1, windows will send ACK every time it receives a TCP package.
2 - TCPNoDelay
This one is pretty simple
info here: Microsoft Corporation
Type "regedit" in windows "run.." dialog to bring up registry menu
Then find:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSMQ\Parameters
Right-click in the right hand pane and add a new DWORD value, name it TCPNoDelay, then right click the entry and click Modify and assign a value of 1.
[EDIT] Some people it seems don't have a MSMQ entry in their registry. You will need to add it, to do this the simplest way is to copy/paste the below code into a empty text file, and save it as a .reg file (just call it msmq.reg). Once done right click the file and select MERGE and click yes to the box that follows.
******snip below******
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSMQ]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSMQ\Parameters]
"TCPNoDelay"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSMQ\Parameters\OCMsetup]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSMQ\Parameters\Security]
"SecureDSCommunication"=dword:00000000
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSMQ\Parameters\setup]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSMQ\Setup]
******snip above******
Click Ok and close the registry editor, then reboot your PC.
Post results below
Baalzaman - location NEW ZEALAND
Before: 400-450ms in Shatt
After: 230ms average