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#1
hmm I had disabled mine.
An Update on Windows TCP AutoTuningLevel
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New #2
I do not understand any of this stuff, that is why I rely on TCP Optimizer, which obviously sets it as it should be.
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New #3
Disabling this is a Current Fix I have seen for many with Realtek Nics' and seemed to help a while back with one of my systems. Though I am not knowledgeable enough to advise further one way or the other myself.
I actually thought TCP Optimisers had gone the way of the Dodo , so will check it out.
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"Realtek NIC Fix"
I had problems with win 10 64 bit and my onboard lan interface. This solved the problem. It may also fix wifi based cards
run cmd box in admin mode and enter ( you can do this via task manager, file, new task tick admin privileges)
netsh int tcp set global autotuninglevel=disabled (press enter)
you can also try =restricted or highlyrestricted as option for best results.
the default is normal which causes errors on realtek lan cards.
Even using latest Realtek v10 win 10 driver
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New #5
I just got TCP Optimiser 4 but it looks like either Windows or the Realtek Nic Driver is disabling stuff again ,assuming Optimiser is working like I think it should? Will have another look when I have a bit more time.
KB.
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New #6
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An Update on Windows TCP AutoTuningLevel
Posted: 12 Aug 2016
Like all modern operating systems Windows has receive window auto-tuning to dynamically adjust the receive buffer size to the throughput and latency of the link. Disabling this feature will definitely limit your Internet speeds. Auto-tuning is consistent throughout all variants of TCP and present in all modern operating systems. In the modern Internet the range of latencies and throughput speeds that must be accommodated is simply too large to manage statically and must be adjusted dynamically. If you have changed your AutoTuningLevel to disabled, please reset it to normal in order to restore your Internet speeds using the following commands in an elevated command prompt:
PS C:\WINDOWS\system32> netsh int tcp set global autotuninglevel=normal
Ok.
PS C:\WINDOWS\system32> netsh interface tcp show global
Querying active state...
TCP Global Parameters
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Receive-Side Scaling State : enabled
Chimney Offload State : disabled
NetDMA State : disabled
Direct Cache Access (DCA) : disabled
Receive Window Auto-Tuning Level : normal
Add-On Congestion Control Provider : none
ECN Capability : disabled
RFC 1323 Timestamps : disabled
Initial RTO : 3000
Receive Segment Coalescing State : disabled
Non Sack Rtt Resiliency : disabled
Max SYN Retransmissions : 2
TCP Fast Open : enabled
Some of the confusion may have originated from a misinterpretation of a blog post which suggests disabling heuristics with the following command:
Code:netsh interface tcp set heuristics disabled
Heuristics is a feature that can interfere with auto-tuning and disabling it can improve Internet speeds and in fact heuristics have already been disabled in Windows 8.1 and greater. Auto-Tuning on the other hand should NEVER be disabled.
Source: An Update on Windows TCP AutoTuningLevel | Networking Blog
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