HOW TO eliminate_vistas_network_bottlenecks Vista News Discuss HOW TO eliminate_vistas_network_bottlenecks in the Windows Vista forums; The problem with Vista's new-fangled network stack All this automatic tuning of the Vista network stack sounds great in theory, but the problem is that some clients don’...

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The problem with Vista's new-fangled network stack

All this automatic tuning of the Vista network stack sounds great in theory, but the problem is that some clients don’t support TCP window scaling, or do but don’t have it enabled. Additionally, some firewall products also don’t support it. In either scenario, the result is dropped packets which affects network performance horrendously -- your traffic is literally dropping into a black hole, never to be seen again.

So if you’re experiencing excessive network lags on your Vista machine, especially compared to non-Vista machines, it might be worthwhile disabling auto-tuning. Do this by opening up an administrative Command Window (right-click, Run as administrator), and type in the following command:

netsh interface tcp set global autotuninglevel=disabled

You may also need to type in:

netsh interface tcp set global rss=disabled

The changes take effect straight away, with no reboot needed. Bear in mind that this is a global change, so it may really be worth your while to sit down and nut through your network's QoS settings to get things running happily without disabling auto-tuning.

Personally, I needed to RDP to that server as a matter of urgency, and disabling auto-tuning definitely did the trick.



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