Shortcut Forwarding Engine

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KILLERDOG
DD-WRT User


Joined: 05 Oct 2010
Posts: 80

PostPosted: Sun Apr 21, 2024 19:52    Post subject: Shortcut Forwarding Engine Reply with quote
Hi Everyone,

Can i ask how important this feature is and what it actually does ? Thanks :)

I have a 1 gig connection and 104 mbps upload. Also im using DD-WRT wifi drivers, should i be on Vanilla ?
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Wildlion
DD-WRT Guru


Joined: 24 May 2016
Posts: 1449

PostPosted: Sun Apr 21, 2024 22:04    Post subject: Reply with quote
Read: https://wiki.dd-wrt.com/wiki/index.php/Hardware#Flow_Acceleration.2C_SFE_and_Cut-Through_Forwarding

I have heard mixed results on the forum and it depends on your setup. In general, if everything works and you are not using something like QoS, yes you would want SFE enabled.
Alozaros
DD-WRT Guru


Joined: 16 Nov 2015
Posts: 6901
Location: UK, London, just across the river..

PostPosted: Mon Apr 22, 2024 9:55    Post subject: Reply with quote
SFE is enabled by default..but..I prefer not to use it.. Razz
It is a software packet acceleration engine, that has a purpose to increase the WAN to LAN performance...(WAN speed) but, it could also break some things..so, unless its not needed, i turn it off Razz
my ISP speed is not matching my router CPU capabilities...yet.. Cool

_________________
Atheros
TP-Link WR740Nv1 ---DD-WRT 58184 WAP
TP-Link WR1043NDv2 -DD-WRT 61848 Gateway/DoT,Forced DNS,Ad-Block,Firewall,x4VLAN,VPN
TP-Link WR1043NDv2 -Gargoyle OS 1.15.x AP,DNS,QoS,Quotas
Qualcomm-Atheros
Netgear XR500 --DD-WRT 61915 Gateway/DoT,AD-Block,Forced DNS,AP&Net Isolation,x2VLAN,Vanilla
Netgear R7800 --DD-WRT 61915 Gateway/DNSCryptv2,AD-Block,Forced DNS,AP&Net Isolation,x3VLAN,Firewall,Vanilla
Netgear R9000 --DD-WRT 61848 Gateway/DoT,AD-Block,AP Isolation,Firewall,Forced DNS,x2VLAN,Vanilla
Dynalink DL-WRX36-DDWRT 61745
Broadcom
Netgear R7000 --DD-WRT 61745 Gateway/DNScrypt-proxy2/AD-Block,IPset Firewall,Forced DNS,x4VLAN,VPN
NOT USING 5Ghz ANYWHERE
------------------------------------------------------
Stubby DNS over TLS I DNSCrypt v2 by mac913
egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 13692
Location: Netherlands

PostPosted: Mon Apr 22, 2024 10:09    Post subject: Reply with quote
Alozaros wrote:
SFE is enabled by default..but..I prefer not to use it.. Razz
It is a software packet acceleration engine, that has a purpose to increase the WAN to LAN performance...(WAN speed) but, it could also break some things..so, unless its not needed, i turn it off Razz
my ISP speed is not matching my router CPU capabilities...yet.. Cool


I fully agree.
It used to be automatically turned off if you have virtual interfaces.
When having more than one interface SFE might become confused and use the wrong interface.
This can lead to all kinds of spurious routing errors and packet loss.
Chances are small (it probably happens as both interfaces switch to SFE path at the exact same time) but still a liability.
Furthermore Bandwidth monitoring is not accurate any more and some forms of QoS do not work with it.

SFE and other accelerators are a stop gap for underpowered routers.

My DL-WRX36 (costs about E 100) has quad core arm A53 running at 2.2 GHz CPU and can easily handle 1 Gb/s throughput and about 800 MB/s WireGuard.
But if you want to have a future proof router use x86

_________________
Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, 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
ho1Aetoo
DD-WRT Guru


Joined: 19 Feb 2019
Posts: 3651
Location: Germany

PostPosted: Mon Apr 22, 2024 10:30    Post subject: Reply with quote
There are many newer ARM CPUs that beat the old x86 with ease.
You need a powerful x86 that consumes significantly more power.

It's no wonder then that a 60 or 80W CPU can beat a 5W ARM CPU.

https://www.piospartslap.de/Fujitsu-Futro-S920-ThinClient-AMD-GX-415GA-SOC-150GHz-2GB-RAM-8GB-SSD-ohne-Netzteil-Fuss_1?

x86 quadcore - but not faster than your dynalink

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Quickstart guides:

use Pi-Hole as simple DNS-Server with DD-WRT

Routers
Marvell OCTEON TX2 - QHora-322 - OpenWrt 24.10.1 - Gateway
Qualcomm IPQ8065 - R7800 - OpenWrt 24.10.1 - WAP
egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 13692
Location: Netherlands

PostPosted: Mon Apr 22, 2024 12:03    Post subject: Reply with quote
The newer ARM CPUs certainly can but not many routers currently have the newer arm CPU's (there are exceptions, you have one I know)

Arm v8 A53 which is used in the newest routers is still a mediocre albeit power efficient Arm core with poor IPC (A7 class), of course clocked at 2.2 GHz and quad core gives some room Smile

Starting with A72 but better A75 is getting somewhere
https://en.wikipedia.org/wiki/Comparison_of_ARM_processors

The A15 ( which is used in R7800) has actually better IPC then A53

_________________
Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, 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
ho1Aetoo
DD-WRT Guru


Joined: 19 Feb 2019
Posts: 3651
Location: Germany

PostPosted: Mon Apr 22, 2024 12:42    Post subject: Reply with quote
https://www.qualcomm.com/products/internet-of-things/networking/wi-fi-networks/networking-pro-series/qualcomm-networking-pro-1620-platform

qualcomm only offers this with the next CPU generation

but there is already ARMv9

https://resources.nvidia.com/en-us-grace-cpu/grace-hopper-superchip

CPU core count 72 Arm Neoverse V2 cores
L1 cache 64KB i-cache + 64KB d-cache
L2 cache 1MB per core
L3 cache 114MB
Base frequency 3.1GHz

enough for a home router Smile

_________________
Quickstart guides:

use Pi-Hole as simple DNS-Server with DD-WRT

Routers
Marvell OCTEON TX2 - QHora-322 - OpenWrt 24.10.1 - Gateway
Qualcomm IPQ8065 - R7800 - OpenWrt 24.10.1 - WAP
KILLERDOG
DD-WRT User


Joined: 05 Oct 2010
Posts: 80

PostPosted: Mon Apr 22, 2024 15:52    Post subject: Reply with quote
OK, great stuff, so i will just turn it off and leave it off. Many thanks also to you all. I have learned so much thanks to the forum members and users, i appreciate more than youll ever know... :)
Laithan
DD-WRT User


Joined: 01 Sep 2018
Posts: 118

PostPosted: Mon Apr 22, 2024 18:35    Post subject: Reply with quote
If DD-WRT is not used as a gateway (AP only) am I correct in saying that SFE has no affect and should be disabled?
dale_gribble39
DD-WRT Guru


Joined: 11 Jun 2022
Posts: 2066

PostPosted: Mon Apr 22, 2024 20:07    Post subject: Reply with quote
It has been noted that in Router mode (not Gateway mode) that SFE may wreak havoc. So, to avoid any possible issues, the answer to your query is yes. However, it isn't necessary to switch to Router mode for wired APs as has also been noted by sir @egc.
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