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Slow network in Vista?

Heres the fix (well, this worked for me).

This problem existed in RC1 and to some extent RC2 too. I did report it, and it’s partially fixed but still not good. Microsoft at the time blamed my Cisco router.. Anyway, I get really poor intermittant network performance. It turns out this is due to a new addition in the TCP/IP stack called Receive Window Auto-Tuning Level.

To check the status of this feature, run “netsh interface tcp show global” at a command prompt.

You will see something like:

Querying active state…

TCP Global Parameters
———————————————-
Receive-Side Scaling State : enabled
Chimney Offload State : enabled
Receive Window Auto-Tuning Level : disabled
Add-On Congestion Control Provider : none
ECN Capability : disabled
RFC 1323 Timestamps : disabled

In this example, you can see I have it disabled. (My network performance returns to normal with it off!).
To disable it, run: “netsh interface tcp set global autotuning=disabled”
To enable it, run: “netsh interface tcp set global autotuning=normal”
(Both these last two should be run from an Administrator Command Prompt, not a “normal” command prompt).

This entry was posted on Saturday, November 18th, 2006 at 2:16 pm and is filed under General. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

6 Responses to “Slow network in Vista?”

  1. Software/Technology Discussion : Vista, Firefox 2, Slow Network Says:
    February 8th, 2007 at 12:21 am

    [...] http://www.neillans.co.uk/?p=165 [...]

  2. Alain’s IT support BLOG - MS Vista slow on some networks Says:
    March 16th, 2007 at 11:31 am

    [...] http://www.neillans.co.uk/?p=165 [...]

  3. christopherm Says:
    May 6th, 2007 at 1:52 am

    I have found the the problem is also resovled by setting Auto-Tuning to HIGH.

    netsh interface tcp set global autotuning=high

  4. Andy Says:
    May 17th, 2007 at 1:29 pm

    Hi Christopher,

    Thanks for the update – I’ll have to try this, as I’ve noticed that my Vista machines still occasionally have difficultly accessing websites whereas my XP machines do not …

    Regards,

    Andy

  5. pepper Says:
    November 5th, 2007 at 2:52 pm

    Hi christopher,
    I read with interest the above, but when i type in what you suggested to change the setting, i get the following message, cn help?

    “Set global command failed on IPv$ The requested operation requires elevation.”

    http://www.stoptalkingnonsense.com

  6. Andy Says:
    November 5th, 2007 at 3:11 pm

    You need to run the command prompt as an administrator; this will give it the correct access rights. To do this, right click on the icon, and select Run As Administrator.

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