Auto Tuning - TCP/IP receive level

ByLine
How to Enable or Disable the Receive Window Auto Tuning Level in Vista
Synopsis
This will show you how to see your current TCP/IP Auto Tunning settings and how to test it to see if you have a problem with it. You will see a list of possible problems associated with this.
How to Enable or Disable the Receive Window Auto Tuning Level in Vista

information   Information
The TCP receive window size (RWIN) is the amount of data that a TCP receiver (your computer) allows a TCP sender (other internet or local network computer) to send before having to wait for an acknowledgement. After the connection is established, the receive window size is advertised in each TCP segment. Advertising that maximum amount of data that the sender can send is a receiver-side flow control mechanism that prevents the sender from sending data that the receiver cannot handle. A sending host can only send at a maximum the amount of data advertised by the receiver before waiting for an acknowledgment and a receive window size update. Auto Tuning adjusts the receive windows size continually based upon the changing network conditions. This usually happens if you have a network device (EX: Router, modem, etc.) that doesn’t support RFC 1323 “TCP Extensions for High Performance”.
Note   Note
The TCP window size field controls the flow of data and is limited to between 2 and 65,535 bytes, and cannot be expanded anymore. Thus, a scaling factor is used to get a larger TCP receive window size to achieve more efficient use of high bandwidth networks. The TCP window scale option is used to increase the maximum window size from 65,535 bytes to 1 Gigabyte. Scaling up to larger TCP congestion window sizes is a part of what is necessary for TCP Tuning.

When dealing with slow network performance in Vista, the problem may be due to the above mentioned TCP Window Scaling option, where many older routers and and packet firewalls do not properly implement TCP Window Scaling (doesn’t support RFC 1323), and rewrite the window scaling factor during a transmission, and causing sending and receiving sides to assume different TCP window sizes. The situation causes malfunction Internet connection, non-stable traffic that is very slow, or network connection that is only available intermittently.

Beside, Windows Vista enhances further TCP window scaling with auto tuning feature, where TCP stack in Vista system will auto tune and adjust the RWIN size to increase the percentage of full-sized TCP segments that are used during bulk data transmission based on the network scenario it encountered. And thus it’s no longer possible to specify a custom size for the TCP/IP Receive Window (RWIN) size with the inclusion of new auto tuning feature, unless the application it self uses SO_RCVBUF. However, Vista TCP auto tuning feature may get things wrong sometimes. Instead of optimal true receive window size, incompatible and out of range RWIN size may be used.

By default, Vista in normal auto tuning level will use RWIN size of 256 bytes with a scale factor of 8. This value is not suitable for all routers and servers which does not support TCP scale factor, and continue to communicate with 65536 bytes.

UPDATE: An Update on Windows TCP AutoTuningLevel - Windows 10 Forums

Tip   Tip
Possible TCP/IP Auto Tuning Related Problems:
  • Indefinite delay (hang) when opening the Certificate Services snap-in.
  • Slow (sometimes no) group policy application.
  • Trying to select a domain user in order to add that principal to a local security group (the object picker) would hang indefinitely.
  • Instant Messaging is not working well. Sometimes not at all by not being able to sign in.
  • Access to local file servers (EX: networked drives, etc.) are extremely slow and sometimes did not succeed at all (appears to hang).
  • Internet connection problems.
  • Extremely slow file transfers.
  • Other strange unexplained network connecting issues.
  • Wireless network connection problems
  • Website browsing and downloads are extremely slow.





FIRST
How To See Current Auto Tuning Settings

2. Click on Continue in the UAC prompt.​
3. In the command prompt, type in bold belowand press Enter. (See screenshot below)​
netsh interface tcp show global
Current setting.jpg

4. Close the command prompt when done.​
5. Run through the steps below to see if you have a TCP/IP Auto Tuning issue​





STEP ONE
How to Restrict Auto Tuning

2. Click on Continue in the UAC prompt.​
3. To Restrict Auto Tuning
NOTE: Allows for the receive window to grow beyond the default value of 65,535 bytes, but limits such growth in some scenarios.​
A) In command prompt, type in bold below and press Enter. (See screenshot below)​
netsh interface tcp set global autotuninglevel=restricted

B) You will get a OK response if successful. If not, repeat step 3A.​
Restricted.jpg

C) Go to step 5.​

4. To Highly Restrict Auto Tuning
NOTE: Allows for the receive window to grow beyond the default value of 65,535 bytes, but doing so very conservatively. In this mode, Vista will by default use a RWIN of 16,384 bytes with a scale factor of 2.​
A) In the command prompt, type in bold below and press Enter. (See screenshot below)​
netsh interface tcp set global autotuninglevel=high

B) You will get a OK response if successful. If not, repeat step 4A.​
Highly restricted.jpg


5. Close the command prompt window and restart the computer to apply the changes.​
6. If it fixed your problem stop here. If not, continue to Step Two below.​






STEP TWO
How to Disable Auto Tuning

NOTE: Disables the autotunning feature in Vista completely, and sets and locks the RWIN receive window to the default value as 65536 bytes.
2. Click on Continue in the UAC prompt.​
3. In the command prompt, type in bold belowand press Enter. (See screenshot below)​
netsh interface tcp set global autotuninglevel=disabled

Note   Note
You can also type in bold below and press enter after each command:
Note   Note

  • netsh
  • interface
  • tcp
  • set heuristics disabled
  • set global autotuninglevel=disabled
  • exit
4. You will get a OK response. If not, repeat step 3.​
Disable.jpg

5. Close the command prompt and restart the computer to apply the changes.​
6. If it fixed your problem stop here. If not, you may not have a issue with Auto Tuning and will need to turn it back on. Continue to Step 3 below.​






STEP THREE
How to Enable Auto Tuning Back to Normal Default

NOTE: This turns Auto Tuning back to the default on (Normal) setting in Vista. Allows for the receive window to grow to accommodate almost all scenarios. See NOTE at the top of the tutorial for more on this.
2. Click on Continue in the UAC prompt.​
3. In the command prompt, type in bold below and press Enter. (See screenshot below)​
netsh interface tcp set global autotuninglevel=normal

Note   Note
You can also type in bold below and press enter after each command:
Note   Note

  • netsh
  • interface
  • tcp
  • set heuristics enabled
  • set global autotuninglevel=normal
  • exit
4. You will get a OK response if successful. If not, repeat step 3.​
Enable.jpg

5. Close the command prompt and restart the computer to apply the changes.​
That's it,
Shawn


 

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pacinitaly

HappyGuru Lovin2Help
Vista Guru
thank shawn!!!! this works

1. Click Start. 2. Click All Programs. 3. Click Accessories. 4. Click Command Prompt. 5. On Command prompt type: cd.. (press Enter). Now do it again: cd.. (press Enter). 6. Now type the following commands (for each command dont forget to press Enter): netsh interface tcp set global autotuning=disabled netsh interface tcp set global chimney=disabled netsh interface tcp set global rss=disabled 7. Reboot your computer for the changes to take effect. 8. If you want to revert everything type the following commands: netsh interface tcp set global autotuning=enabled netsh interface tcp set global chimney=enabled netsh interface tcp set global rss=enabled 9. As usual reboot your system for the changes to take effect.
 

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mvp
You're welcome Pacinitaly. :)

Shawn
 

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Ex_Brit

If you're going through hell, keep going
Vista Guru
Gold Member
Since SP2 some people are seeing those settings not sticking and the procedure to get around that is as follows:

In an elevated Command Prompt...click Enter after each line and to exit when finished type exit then click Enter twice over.

netsh
interface
tcp
set heuristics disabled
set global autotuninglevel=disabled
 

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Brink

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mvp
Thank you Peter. Tutorial has been updated for this. :)
 

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    Windows 10 Pro
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Ex_Brit

If you're going through hell, keep going
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Gold Member
Question, what ramifications, if any, are there from doing this?
 

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mvp
By default, Vista in normal auto tuning level will use RWIN size of 256 bytes with a scale factor of 8. This value may not be suitable for older routers and servers which does not support the TCP scale factor, and continue to communicate with 65536 bytes. This can then cause a slow down in network speeds with auto tuning still set as normal. Routers and servers which do support the TCP scale factor, are usually better with auto tuning set to normal. I say play with it and test to see which setting may give you the best network speed or not.
 

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    Intel i7-8700K 5 GHz
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    ASUS ROG Maximus XI Formula Z390
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    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
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    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
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    Integrated Digital Audio (S/PDIF)
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    2 x Samsung Odyssey G7 27"
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    1TB Samsung 970 EVO Plus M.2,
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    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
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    Windows 10 Pro
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    i7-7500U @ 2.70 GHz
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    16 GB DDR4-2133
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    NVIDIA GeForce 940MX
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    Conexant ISST Audio
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Ex_Brit

If you're going through hell, keep going
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Gold Member
Thanks. I haven't noticed any difference either way personally.
 

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    Asus® P6T Deluxe V2 X58 LGA1366
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    1792 MB NVIDIA® GeForce® GTX 295 Dual Core
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    Onboard Soundmax® High-Definition 7.1 Performance Audio
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    Samsung XL2370 HD LED backlit 23" W/S 2ms response time
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    1920 x 1080
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Brink

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mvp
Yeah, usually the default settings are best unless you have one of these older devices. :)
 

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    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
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    2 x Samsung Odyssey G7 27"
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    Logitech Z625 speaker system,
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    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
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    Windows 10 Pro
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Brink

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mvp
You're welcome Yoranah, and welcome to Vista Forums. :)
 

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    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
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    Logitech Z625 speaker system,
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    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
  • Operating System
    Windows 10 Pro
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    HP Envy Y0F94AV
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    i7-7500U @ 2.70 GHz
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    16 GB DDR4-2133
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    NVIDIA GeForce 940MX
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evomunk

New Member
i'm trying to autotune my TCP/IP levels but i'm required to have "elevation"?

Microsoft Windows [Version 6.0.6002]
Copyright (c) 2006 Microsoft Corporation. All rights reserved.

C:\Users\evomunk>netsh interface tcp show global
Querying active state...

TCP Global Parameters
----------------------------------------------
Receive-Side Scaling State : enabled
Chimney Offload State : disabled
Receive Window Auto-Tuning Level : highlyrestricted
Add-On Congestion Control Provider : none
ECN Capability : disabled
RFC 1323 Timestamps : disabled
** The above autotuninglevel setting is the result of Windows Scaling heuristics

overriding any local/policy configuration.


C:\Users\evomunk>netsh interface tcp set global autotuninglevel=disabled

Set global command failed on IPv4 The requested operation requires elevation.


C:\Users\evomunk>netsh
netsh>interface
netsh interface>tcp
netsh interface tcp>set heuristics disabled

Set heuristics command failed on WSH The requested operation requires elevation.


netsh interface tcp>
 

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Brink

Staff member
mvp
Hello Evomunk, and welcome to Vista Forums.

You just need to open a elevated command prompt instead. (Run as administrator)


Hope this helps,
Shawn
 

My Computers

System One System Two

  • Operating System
    Windows 10 Pro 64-bit
    Manufacturer/Model
    Custom
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G7 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 970 EVO Plus M.2,
    250GB Samsung 960 EVO M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3
    Cooling
    Corsair Hydro H115i
    Mouse
    Logitech MX Master 3
    Keyboard
    Logitech wireless K800
    Internet Speed
    1 Gb/s Download and 35 Mb/s Upload
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
  • Operating System
    Windows 10 Pro
    Manufacturer/Model
    HP Envy Y0F94AV
    CPU
    i7-7500U @ 2.70 GHz
    Memory
    16 GB DDR4-2133
    Graphics card(s)
    NVIDIA GeForce 940MX
    Sound Card
    Conexant ISST Audio
    Monitor(s) Displays
    17.3" UHD IPS touch
    Screen Resolution
    3480 x 2160
    Hard Drives
    512 GB M.2 SSD

prothall

New Member
Hi All, Firstly let me say great site, this speed up vista guide has been awesome.

Anyway on to my issue. After verifying my auto-tune setting at highly restricted and then going into command prompt with elevated mode, I have attempted to change my autotune setting to restricted, off etc, after entering commands specified and getting the "ok" and rebooting it still comes up as highly restricted. I am running home premium x64. I'm on ADSL2+ if that makes any difference. I managed to turn on chimney setting.
 

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Brink

Staff member
mvp
Hello Prothall, and welcome to Vista Forums.

You might see if setting it to normal first, then restrict may allow it not be high.

Hope this helps,
Shawn
 

My Computers

System One System Two

  • Operating System
    Windows 10 Pro 64-bit
    Manufacturer/Model
    Custom
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G7 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 970 EVO Plus M.2,
    250GB Samsung 960 EVO M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3
    Cooling
    Corsair Hydro H115i
    Mouse
    Logitech MX Master 3
    Keyboard
    Logitech wireless K800
    Internet Speed
    1 Gb/s Download and 35 Mb/s Upload
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
  • Operating System
    Windows 10 Pro
    Manufacturer/Model
    HP Envy Y0F94AV
    CPU
    i7-7500U @ 2.70 GHz
    Memory
    16 GB DDR4-2133
    Graphics card(s)
    NVIDIA GeForce 940MX
    Sound Card
    Conexant ISST Audio
    Monitor(s) Displays
    17.3" UHD IPS touch
    Screen Resolution
    3480 x 2160
    Hard Drives
    512 GB M.2 SSD

skillet

New Member
I'm noticing a problem where I receive 35-50MB/sec over my intranet over 1gigabit but it sometimes slows down to 8MB/sec and sustains for the same test tasks.

If I reboot speed goes to 35-50 again.. Sometimes even logging out does it. I've noticed other people say they hit a 8MB/sec limit as well. Has anyone figured out what is limiting or causing it?

I'm loading an image sequence off of a server using a program to test throughput.

I've experimented with the different RSS settings and disabling it and it doesn't seem to make a difference. I also tried chimney offload but in netstat it isn't offloading anything.

Thanks!
 

My Computer

jeffrynov

Member
Omfg i disabled this it was set at high and i also disabled page clearing or whatever and yea but before i did this i was at around 13MBs download and 1MB upload. Now... IM AT 30MBs download!!! But still only 1MB upload. Thank you so much you seriously make me happy ^_^. Now i can tell my friends that i almost know for a fact my connection is better than theirs lol Also i disabled the reserved bandwidth. Thank you so much again!!!

Yes indeed you looked surprise but it doesn't mean your friends can not do the same thing as you did :D just don't tell them the secret our commander Brink told you about :zip::D hehehee and have a Vista day !!
 

My Computer

System One

  • Manufacturer/Model
    Toshiba Satellite M300
    CPU
    Intel core 2Duo
    Memory
    2.00GB
    Graphics Card(s)
    ATI Mobility Radeon HD 3470
    Sound Card
    Conexant High Definition SmartAudio
    Monitor(s) Displays
    Generic PnP
    Screen Resolution
    1280 x 800
    Case
    silk
    Mouse
    Synaptic PS/2 port touchpad
    Keyboard
    Standard PS/2 Keyboard

skillet

New Member
By the way, it's been a while now and I'm on windows7 now...but the issue was that the MMCS (Multimedia Class Scheduler) was slowing down the network speed when I had anything that was multimedia open... quicktimes usually or webpages. I did that hack where you remove the dependency it has on audio in your registry file and then stop the service. It wont let you before that because it has the audio dependency.

Anyways, what it does is slow your net connection down to make sure your quicktimes play smoothly and don't bog your cpu. Stupid idea in my opinion. Lets go slow all the time, to make sure your media doesn't skip. Obviously, it will only skip on slow computers. My 8 core doesn't have this problem.
 

My Computer

I been doing what it said and I get a message about ipv4 something unable to change.
 

My Computer

System One

  • Manufacturer/Model
    Acer Aspire 5315
    Memory
    2 gb
    Hard Drives
    C drive
    D Drive
    Case
    Standard Acer Aspire Case
    Cooling
    Cooling Pad and USB Desklamp/fan combo
    Mouse
    Logitech
    Keyboard
    Logitech
    Internet Speed
    DSL 20mb/s
    Other Info
    I run a 60watt speakers from my headphone jack, and I got 10port USB HUB USB Wireless adapter foer the internet

Brink

Staff member
mvp
Hello Tom,

Could you post a screenshot of what you are getting? :)
 

My Computers

System One System Two

  • Operating System
    Windows 10 Pro 64-bit
    Manufacturer/Model
    Custom
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G7 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 970 EVO Plus M.2,
    250GB Samsung 960 EVO M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3
    Cooling
    Corsair Hydro H115i
    Mouse
    Logitech MX Master 3
    Keyboard
    Logitech wireless K800
    Internet Speed
    1 Gb/s Download and 35 Mb/s Upload
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
  • Operating System
    Windows 10 Pro
    Manufacturer/Model
    HP Envy Y0F94AV
    CPU
    i7-7500U @ 2.70 GHz
    Memory
    16 GB DDR4-2133
    Graphics card(s)
    NVIDIA GeForce 940MX
    Sound Card
    Conexant ISST Audio
    Monitor(s) Displays
    17.3" UHD IPS touch
    Screen Resolution
    3480 x 2160
    Hard Drives
    512 GB M.2 SSD
Actually I got it thanks... I just need to know in plain english what is the highest setting???
 

My Computer

System One

  • Manufacturer/Model
    Acer Aspire 5315
    Memory
    2 gb
    Hard Drives
    C drive
    D Drive
    Case
    Standard Acer Aspire Case
    Cooling
    Cooling Pad and USB Desklamp/fan combo
    Mouse
    Logitech
    Keyboard
    Logitech
    Internet Speed
    DSL 20mb/s
    Other Info
    I run a 60watt speakers from my headphone jack, and I got 10port USB HUB USB Wireless adapter foer the internet
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