Low LAN/WLAN speeds compared to stock firmware.

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Vulkerino
DD-WRT Novice


Joined: 25 Jan 2018
Posts: 1

PostPosted: Thu Jan 25, 2018 21:22    Post subject: Low LAN/WLAN speeds compared to stock firmware. Reply with quote
Hi there,

I have a Netgear R6400 and I flashed DD-WRT on it for the QoS capabilities. After flashing it on my router, I witnessed a significant decrease in speed in general (85%). Keep in mind I pay for 1gbps Down & Up and I have a fully fibre connection from the wall. My speeds from the wall are 900mbps down and 930mpbs up. On stock Netgear Genie firmware I get 850mbps down and 900mbps up (slight decrease but not noticeable. Now with DD-WRT flashed on it I get 150mbps down and 180 mbps. Am I configuring something wrong in the router? Does DD-WRT simply not support gigabit connections? Is there any other firmware that I can utilize that provides me with similar speeds to that of the stock firmware? Also my main goal with QoS is to reduce bufferbloat as much as possible as I play at highly competitive level.

Any help will be great! Thanks for reading.
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eibgrad
DD-WRT Guru


Joined: 18 Sep 2010
Posts: 8034

PostPosted: Fri Jan 26, 2018 0:37    Post subject: Reply with quote
Something to keep in mind when dealing w/ dd-wrt (or any third party firmware for that matter) and routers that employ hardware NAT (aka SFE).

Many of these routers achieve these speeds by "breaking the rules", i.e., standards. And it's only possible because the OEM firmware has been specifically built around these *proprietary* changes. And being OEM, they can limit access to those things that would otherwise break those proprietary features.

Third party firmware doesn't have that luxury. It's goal is to support a wide variety of hardware, in a consistent way, using well established standards. By definition, this limits how much and how well third party firmware can embrace these proprietary features.

In short, anyone using NAT hardware is left w/ a difficult choice. Performance or third party features? Yes, dd-wrt does try to embrace it, and w/ some level of success, but if you peruse the forums, you'll find plenty of problems too.

As of the moment, you can't use QoS nor OpenVPN PBR (policy based routing) at the same time as SFE. In older builds, QoS and PBR just break. And in more recent builds, the developers have decided to automatically disable QoS (not sure about PBR) whenever SFE is enabled (or maybe it's vice-versa, even I'm losing track).

So while I can't be absolutely sure how the above is affecting your current configuration, I do know the use of hardware NAT w/ third party firmware is, and always will be, problematic.
mrjcd
DD-WRT Guru


Joined: 31 Jan 2015
Posts: 4763
Location: Texas

PostPosted: Fri Jan 26, 2018 1:36    Post subject: Reply with quote
eibgrad wrote:
the developers have decided to automatically disable QoS (not sure about PBR) whenever SFE is enabled (or maybe it's vice-versa, even I'm losing track)

Actually SFE is disabled if QOS is enabled ...wait it gets better ... The radio button next to SFE will still show as enabled even when it isn't.
Have to check 'lsmod' if want to know what is really still running.
But yet again, Kong builds (for IPQ806x routers .. not sure about his brcm builds) the SFE is still on when QOS is enabled but QOS only works for upload leaving DL wide open.
IMO, what I just mentioned would scare most normal newcomers .... or in the least make them wonder WTH is going on here Rolling Eyes

don't mind me ...just passing thru
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