What is disabling Shortcut Forwarding Engine on my R9000?

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foobarfoo
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Joined: 12 Sep 2008
Posts: 25

PostPosted: Fri Apr 30, 2021 22:40    Post subject: What is disabling Shortcut Forwarding Engine on my R9000? Reply with quote
My Netgear R9000 LAN/WAN performance has been worse than I expected (typically 350 to 500 Mbit/s from a wired test client across a 1.2Gbps provisioned cable connection) and I started investigating why. Despite having Shortcut Forwarding Engine (SFE) set to Enable on the 'Setup/Basic Setup' tab, I found it wasn't actually working. When I ran lsmod, no 'fast_classifier' kernel module was loaded.

When I look at the output of 'nvram get sfe', it returns 1.

In my setup, I have three bridged networks:
1) the default bridge that comes with the normal FW
2) a second bridge that is bound to it's own WLAN1.1 (2.4Ghz) virtual AP for a segmented off guest network
3) a third bridge that is bound to it's own WLAN1.2 (2.4Ghz) virtual AP for a segmented off IoT device network

I also have QoS (HFSC/CAKE) enabled, to ensure that not all of my extremely limited 35Mbit/s upload bandwidth is occupied by certain upload-hungry clients.

If I manually 'modprobe fast_classifier', the SFE kernel module is loaded successfully and my LAN/WAN performance goes up to 650-750Mbit/s from the same wired test client.

A few questions:
1) What decides whether the 'fast_classifier' kernel module is loaded or not...what are the gates? I read somewhere that un-bridged connections cause this but I don't think I have any?
2) What problem will I cause by loading the module manually? The other networks still seem to be working and properly segmented.

I'm currently running on build R46316
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egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 9611
Location: Netherlands

PostPosted: Wed May 05, 2021 8:21    Post subject: Reply with quote
SFE is not compatible with QoS and not with unbridged interfaces
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Routers:Netgear R7800, R6400v1, R6400v2, Linksys EA8500, EA6900 (XvortexCFE), E2000 (converted WRT320N), WRT54GS v1.
Install guide R6400v2, R6700v3,XR300:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800/XR500: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
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