How to correctly set Receive Side Scaling (RSS)

[sadboytunaswag31]

Intel NIC Driver:

ReceiveScalingMode:
0 = No scaling, simple interrupt model, Disabled.
1 = RSS enabled (default hashing)
2 = MSI-X / Enhanced scaling mode

InterruptMode:
0 = Legacy ( Simple IRQ setup, no per-queue affinity, less efficient )
1 = MSI ( only one interrupt vector used )
2 = MSI-X ( Calls subroutines to register many IRQs and assign to queues )
3* = Adaptive / Auto ( Tries MSI-X, falls back to MSI or Legacy depending on caps )

EnableLHRssWA (*Enable Low Hash Receive Side Scaling Workaround):
Additional flags are set on the RSS hashing configuration, when Enabled ( Default = 1 ).
0 = Disabled
1 = Enabled
EnableLHRssWA only influences behavior when ReceiveScalingMode == 1

DisablePortScaling
0 = Disabled
1 = Enabled ( Default )

ManyCoreScaling - ( DisablePortScaling needs to be Disabled )
0 = Disabled
1 = Enabled ( Default )




I think this should be correct, as far as I've looked at the NIC driver. You could test it with benchmarks.

where do i find these settings so i can change them? i dont see them in:

control panel
my nic
Right-click your NIC → Properties
configure
Advanced tab

also didnt find them in regedit: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\
{4d36e972-e325-11ce-bfc1-08002be10318}

where can i find these.

i got an intel i226V pcie nic

[St1cky]

Run this Powershell:

$ErrorActionPreference = "SilentlyContinue"

$ClassRoot = "HKLM:\SYSTEM\CurrentControlSet\Control\Class"
$EnumRoot = "HKLM:\SYSTEM\CurrentControlSet\Enum"

Get-CimInstance Win32_NetworkAdapter |
Where-Object {
$_.NetEnabled -eq $true -and
$_.PhysicalAdapter -eq $true -and
$_.PNPDeviceID
} |
ForEach-Object {
$nic = $_

$enumPath = Join-Path $EnumRoot ($nic.PNPDeviceID -replace '\\', '\')
$enumItem = Get-ItemProperty -Path $enumPath

$driverRel = $enumItem.Driver
$classPath = Join-Path $ClassRoot $driverRel
$classItem = Get-ItemProperty -Path $classPath

[PSCustomObject]@{
Name = $nic.NetConnectionID
Description = $nic.Name
Status = $nic.NetConnectionStatus
MAC = $nic.MACAddress
GUID = $nic.GUID
PNPDeviceID = $nic.PNPDeviceID
RegistrySubkey = Split-Path $driverRel -Leaf
DriverRelative = $driverRel
RegistryPath = $classPath
DriverDesc = $classItem.DriverDesc
ProviderName = $classItem.ProviderName
DriverVersion = $classItem.DriverVersion
}
} | Format-List

Then select your RegistryPath, example (remove ":") Prefix is important here for active nic 0000:
HKLM\SYSTEM\CurrentControlSet\Control\Class\{4d36e972-e325-11ce-bfc1-08002be10318}\0000

There you create Dword32bit or REG_SZ, you could add them to device manager too, but i wouldnt bother with it.


I will create a new network tweaker soon, that will do all that and additional stuff. But i currently have other Projects to work on.
- It will include all known network parameters.
- The ability to modify the Windows TCP/IP stack, in addition to managing all network services.
- Automatic calculation of optimal RSS values.
- Internal driver querying (where possible) to detect available RSS Features, Status and other parameters.
- Binary scan for valid settings (this will show or hide settings depending on whether they are present or not).
- And much more.

[EchoGhost]

Run this Powershell:

$ErrorActionPreference = "SilentlyContinue"

$ClassRoot = "HKLM:\SYSTEM\CurrentControlSet\Control\Class"
$EnumRoot = "HKLM:\SYSTEM\CurrentControlSet\Enum"

Get-CimInstance Win32_NetworkAdapter |
Where-Object {
$_.NetEnabled -eq $true -and
$_.PhysicalAdapter -eq $true -and
$_.PNPDeviceID
} |
ForEach-Object {
$nic = $_

$enumPath = Join-Path $EnumRoot ($nic.PNPDeviceID -replace '\\', '\')
$enumItem = Get-ItemProperty -Path $enumPath

$driverRel = $enumItem.Driver
$classPath = Join-Path $ClassRoot $driverRel
$classItem = Get-ItemProperty -Path $classPath

[PSCustomObject]@{
Name = $nic.NetConnectionID
Description = $nic.Name
Status = $nic.NetConnectionStatus
MAC = $nic.MACAddress
GUID = $nic.GUID
PNPDeviceID = $nic.PNPDeviceID
RegistrySubkey = Split-Path $driverRel -Leaf
DriverRelative = $driverRel
RegistryPath = $classPath
DriverDesc = $classItem.DriverDesc
ProviderName = $classItem.ProviderName
DriverVersion = $classItem.DriverVersion
}
} | Format-List

Then select your RegistryPath, example (remove ":") Prefix is important here for active nic 0000:
HKLM\SYSTEM\CurrentControlSet\Control\Class\{4d36e972-e325-11ce-bfc1-08002be10318}\0000

There you create Dword32bit or REG_SZ, you could add them to device manager too, but i wouldnt bother with it.


I will create a new network tweaker soon, that will do all that and additional stuff. But i currently have other Projects to work on.

Glad to hear it man. I'm still using the old one of yours although it couldn't set RSS properly lol.

[St1cky]

Glad to hear it man. I'm still using the old one of yours although it couldn't set RSS properly lol.

My old tweaker was never truly finished; it really just served to provide a rough overview of what was going on in the background. My next tweaker won't be built in PowerShell, nor will i share source code publicly —I've seen far too often how people take my projects and simply rebrand them. Even with a Modding-Progam I once published, someone simply changed a line or two and then put their name right next to mine—without telling me or doing anything of the sort. In my eyes, that is completely unacceptable.
I will publish it only without the source code. That really shouldn't be a problem for most people.

Example:
https://www.youtube.com/watch?v=AHjbosc_sFU

And it's a shame that RSS didn't work out for you, "ReceiveScalingMode" very often blocks RSS or bad combinations.

[EchoGhost]

Glad to hear it man. I'm still using the old one of yours although it couldn't set RSS properly lol.

My old tweaker was never truly finished; it really just served to provide a rough overview of what was going on in the background. My next tweaker won't be built in PowerShell, nor will i share source code publicly —I've seen far too often how people take my projects and simply rebrand them. Even with a Modding-Progam I once published, someone simply changed a line or two and then put their name right next to mine—without telling me or doing anything of the sort. In my eyes, that is completely unacceptable.
I will publish it only without the source code. That really shouldn't be a problem for most people.

Example:
https://www.youtube.com/watch?v=AHjbosc_sFU

And it's a shame that RSS didn't work out for you, "ReceiveScalingMode" very often blocks RSS or bad combinations.

Yes, I knew exactly who that was when you mentioned it. He didn't even bother to hide the fact that he stole it.