January 14, 2008
Find your bandwidth in Vista really slow? Here is a simple hack for you.
So, since the beginning of beta testing on Vista I have always found the new TCP stack to be overly hyped, and rarely with the performance you would expect.
Charlie and I have always hacked the registry to turn off autotuning, TCP Chimney and Receive-side scaling. Recently I had 3 employees within a matter of minutes come up to me complaining that their bandwidth sucked, which was actually affecting customers as they were getting dropped from our online chat support system. Not good.
So I mucked with netsh and remotely tuned their NICs. The result was quickly seen. They went from 700Kbit download speeds to 18Mbit. Yes that's right. It makes that much of a difference.
To be fair, Vista SP1 has this cleaned up pretty well now, but if you are like my employees and are freaking out and can't wait, start a cmd window as an administrator (* see below) ... and type this magic in:
netsh interface tcp set global autotuning=disabled
Do that and then run another speed test. You will probably find it works REALLY well. Well, except to other Windows Server 2008 systems, where the stack really comes into play.
If you are unsure if you have the settings on or off, you can run:
netsh interface tcp show global
Of course, if you need to turn it back on, you can do this by typing:
netsh interface tcp set global autotuning=normal
*NOTE: To start a cmd window as an Administrator click on the Start orb on the bottom left and type "cmd" in the Search field, but do NOT hit enter. Right click on the cmd window icon and select "Run as Administrator".
UPDATE: Thanks to Lawerence and Bruce for correcting the syntax for re-enabling itPosted by SilverStr at January 14, 2008 11:56 AM | TrackBack