How to enable SMB Multichannel in Windows 11

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Network adapter requires to support RSS (Receive Side Scaling).

RSS (Receive Side Scaling)

  • Open PowerShell as administrator in Windows 11, run and enable SMB Multichannel (should be enabled by default):
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PS C:\> Set-SmbClientConfiguration -EnableMultiChannel $true

Confirm
Are you sure you want to perform this action?
Performing operation 'Modify' on Target 'SMB Client Configuration'.
[Y] Yes  [A] Yes to All  [N] No  [L] No to All  [S] Suspend  [?] Help (default is "Y"):

Check network interfaces which show “RSS capable = True“:

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PS C:\> Get-SmbClientNetworkInterface

Interface Index RSS Capable RDMA Capable Speed   IpAddresses                               Friendly Name
--------------- ----------- ------------ -----   -----------                               -------------
17              True        False        20 Gbps {}                                        X710-1-WFP Native MAC Layer LightWeight Filter-0000
8               False       False        10 Gbps {}                                        X710-1
13              False       False        10 Gbps {}                                        X710-2
26              True        False        20 Gbps {fe80::923a:90de:dedd:ef44, 192.168.0.98} NIC-Team
  • Verify there are any active SMB connections:
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PS C:\> Get-SmbConnection

ServerName ShareName UserName         Credential                               Dialect NumOpens
---------- --------- --------         ----------                               ------- --------
Synology   NAS Drive RIPTIDE\terrence MicrosoftAccount\terrence.miao@mail.net  3.1.1   2
  • Copy a large file to a SMB device, e.g., Synology NAS which also has SMB Multichannel enabled, then verify the SMB Multichannel is working:
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PS C:\> Get-SmbMultichannelConnection -IncludeNotSelected

Server Name Selected Client IP    Server IP       Client Interface Index Server Interface Index Client RSS Capable Client RDMA Capable
----------- -------- ---------    ---------       ---------------------- ---------------------- ------------------ -------------------
Synology    True     192.168.0.98 192.168.0.112   26                     5                      False              False
Synology    False    192.168.0.98 192.168.0.34    26                     4                      False              False
Synology    False    192.168.0.98 192.168.196.140 26                     7                      False              False

192.168.0.98 is Windows 11 network address, after Network Teaming; 192.168.0.112 and 192.168.0.34 are Synology NAS network addresses.

With and without multichannel

References

Contents

  1. References