Windows 10: Can TCP Chimney Offload and NETDMA be enabled at a same time in windows 10?

Discus and support Can TCP Chimney Offload and NETDMA be enabled at a same time in windows 10? in Windows 10 Network and Sharing to solve the problem; I have recently referred to this article ->... Discussion in 'Windows 10 Network and Sharing' started by Komal HariShrestha, Jun 14, 2021.

  1. Can TCP Chimney Offload and NETDMA be enabled at a same time in windows 10?


    I have recently referred to this article -> https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/gg162716v=ws.10?redirectedfrom=MSDN .In this article, there is given description about NETDMA. There is also some requirements to use NETDMA.Like;Requirements for NetDMANetDMA must be enabled in BIOS.CPU must support Intel I/O Acceleration Technology I/OAT.You cannot use TCP Chimney Offload and NetDMA together.I am confused with third requirement You cannot use TCP Chimney Offload and NetDMA together. As, In my windows both NETDMA and TCP

    :)
     
    Komal HariShrestha, Jun 14, 2021
    #1
  2. Brink Win User

    An Update on Windows TCP AutoTuningLevel


    Some of the confusion may have originated from a misinterpretation of a blog post which suggests disabling heuristics with the following command:

    Code:
    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
     
    Brink, Jun 14, 2021
    #2
  3. What's holding me back from 100% utilization?

    Can TCP Chimney Offload and NETDMA be enabled at a same time in windows 10? [​IMG]



    netsh int tcp set global autotuninglevel=disabled
    netsh int tcp set global congestionprovider=ctcp
    netsh int tcp set global ecncapability=enable
    netsh int tcp set global chimney=enabled
    netsh int tcp set global dca=enabled
    netsh interface ipv4 show subinterface

    C:\Windows\system32> netsh int tcp show global
    Querying active state...

    TCP Global Parameters
    ----------------------------------------------
    Receive-Side Scaling State : enabled
    Chimney Offload State : enabled
    NetDMA State : enabled
    Direct Cache Acess (DCA) : disabled
    Receive Window Auto-Tuning Level : disabled
    Add-On Congestion Control Provider : ctcp
    ECN Capability : enabled
    RFC 1323 Timestamps : disabled

    I believe it's a physical limitation of my drive speeds, just curious if anybody else has some thoughts.

    My throughput test shows I can do about 670mbps which is equal to about 67% but im getting around 75% utilization so I don't really trust it.

    Currently a Airport Extreme > 30m cat5e > Netgear gig switch > PC
     
    freaksavior, Jun 14, 2021
    #3
  4. brendo234 Win User

    Can TCP Chimney Offload and NETDMA be enabled at a same time in windows 10?

    Extremely slow VPN connection between Windows 10 client and Windows 2008 R2 Server

    After a bit of hassle setting up and configuring my VPN connection on Windows 10, I finally got it connecting to our Windows 2008 R2 server using RRAS.

    When establishing the connection, it connects extremely quickly, but upon connecting to file shares, browsing is slow and opening/transferring files can be painfully slow.

    Below are some of my current settings on both the Client and Server. If anyone has any ideas on how to potentially decrease lag in the connection I'd appreciate it.

    Questions:
    Can/should I tweak TCP settings on the server?
    Can/should I tweak settings on the client(s)?

    Current Server Settings (Win Server 2008 R2):

    • TCP Window Auto-Tuning: normal
    • Windows Scaling Heuristics: disabled
    • Congestion Control Provider: ctcp
    • RSS: enabled
    • TCPA: enabled
    • DCA: disabled
    • TTL:
    • ECN Capability: disabled
    • Checksum Offloading: default: n/a
    • TCP Chimney Offload: automatic
    • TCP1323 Options:
    • Window Scaling: unchecked
    • Timestamps: unchecked

    Current client Settings (Win 10):

    • TCP Window Auto Tuning: normal
    • Windows Scaling Heuristics: disabled
    • Congestion Control Provider: ctcp
    • RSS:
    • RSC:
    • DCA:
    • TTL:
    • ECN Capability: disabled
    • Checksum Offloading:
    • TCP Chimney Offload:
    • LSO:
    • TCP 1323 Timestamps: disabled

    Things I have tried:

    • Turning on Window Scaling
    • Disabling Offloading features (TCP/RSS/Chimney)

    I'm new to VPN connections, so any help would be appreciated, or if there are any tests that I should run on the connection please let me know.
     
    brendo234, Jun 14, 2021
    #4
Thema:

Can TCP Chimney Offload and NETDMA be enabled at a same time in windows 10?

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