Current thoughts on SFE

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ellick
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Joined: 28 Mar 2016
Posts: 67

PostPosted: Sun Jun 02, 2019 15:06    Post subject: Current thoughts on SFE Reply with quote
I'm currently using Build: 05-30-2019-r39884 after a long time using Openwrt on my WRT1900acs v.1 router.

I'm using the fq-codel discipline of QoS which isn't quite as good for bufferbloat as OpenWrt's implementation for me. Still acceptable.

My main reason for switching to dd-wrt was more ease of use and ability to get openvpn working with PBR. The last time I tried dd-wrt I couldn't even get the 5Ghz radio to work but everything seems great this time around. Kudos to the developers.

I was wondering what people's latest thoughts were about SFE? I can get good speed without it but it does seem to help a little bit and with less bufferbloat. Doing searches, I find most people suggest turning it off but those posts were often well over a year old. Is it still suggested to turn it off and, if so, why?
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Per Yngve Berg
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Joined: 13 Aug 2013
Posts: 5003
Location: Akershus, Norway

PostPosted: Sun Jun 02, 2019 16:23    Post subject: Reply with quote
It all depends of your Internet speed. With 100 Mbit/s, you should be able to max out without the SFE. Do you have a higher speed than that?
ellick
DD-WRT User


Joined: 28 Mar 2016
Posts: 67

PostPosted: Sun Jun 02, 2019 16:28    Post subject: Reply with quote
I have 400/20 speed but I find I can get over that download speed even with QoS turned on and SFE off.

SFE does seem to help some with bufferbloat. I guess I was just curious why people think it should be turned off. Is there some problem with it or is it just a matter of it taxing the hardware more?
Per Yngve Berg
DD-WRT Guru


Joined: 13 Aug 2013
Posts: 5003
Location: Akershus, Norway

PostPosted: Sun Jun 02, 2019 16:53    Post subject: Reply with quote
It does not work together with QOS. It will bypass some code in the Firewall to speed up WAN-LAN traffic.
If you enabled QOS, it's probably disabled even if it's enabled.
d0ug
DD-WRT Guru


Joined: 31 Jul 2015
Posts: 722

PostPosted: Fri Jun 07, 2019 11:26    Post subject: Reply with quote
My understanding is that SFE is still broken for anything but the most basic vanilla configuration. Advanced uses like QOS, PBR with OpenVPN, and advanced iptables rules will not work with it enabled.

Basically if you are using your router only to a level where you are still able to use SFE, you may as well have just stuck with the stock firmware
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