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Windows 7: for those who have network issues

28 Dec 2009   #1

windows 7 ultimate x64
for those who have network issues

apologies if this is already known, I do see this feature mention on the vista64 sister site of this site but the documentation there doesnt match my experience.

I had autotuning set to highly restricted and noticed web browsing seemed a little sluggish although not as slow as XP was but slower than vista and my laptop. Also downloads from overseas were slow.

It seems tcp windows scaling was not been activated and autotuning was acting the same as if it was disabled, if I set to normal I did get scaling but I dont find the normal setting optimal.

It seems there is an extra setting related to heuristics, I dont know exactly what it does but it does affect how autotuning works. Immediatly after turning it off the behaviour of autotuning changed back to how I am used to it working and web browsing is now faster again, with heuristics off but autotuning on highlyrestricted I now get rwin autotuned up to a max value of 262144 bytes again.

For those with network problems and want to try my optimal setting run these commands in a elevated command prompt.

netsh int tcp set heuristics disabled
netsh int tcp set global autotuning=highlyrestricted

if you dont like the results then this is how to change back to the defaults.

netsh int tcp set heuristics enabled
netsh int tcp set global autotuning=normal

as a guess heuristics I expect was put in to try and control the reported problems there was in vista as it seems to make autotuning more conservative in using scaling.

My System SpecsSystem Spec


 for those who have network issues

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