[FS#487] VGV7510KW22 / o2 Box 6431 / RT3062F: Very poor Wi-Fi performance

[LEDE Bugs]

The following task has a new comment added:

FS#487 - VGV7510KW22 / o2 Box 6431 / RT3062F: Very poor Wi-Fi performance
User who did this - Mathias Kresin (mkresin)

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I've done a wireless benchmark recently and I'm not able to reproduce the wireless performance issue:

https://www.spinics.net/lists/linux-wireless/msg171568.html

https://www.spinics.net/lists/linux-wireless/msg171734.html

Whatever it is that you're facing it doesn't look like that something in general is broken.

Might be that the 2.4GHz band is just overcrouded at your place.

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The limited ethernet bandwidth is a known issue.

Any traffic originating or targeting the o2 Box itself is limited to somewhat around 100Mbit/s. It is the maximum bandwidth the CPU is able to handle in software. Since routing and NAT is done in software (using netfilter framework of the linux kernel), both are hit by the 100Mbit/s cap.

To achieve more bandwidth, support for the hardware accelerated routing/NAT is required. To my knowledge nobody is working on this topic at the moment. One of the reasons is that the datasheets are only available under NDA and I'm not aware that anyone not having a contract with/being a customer of lantiq was ever able to get hands on the datasheets.

I've done some benchmarking using the kernel 4.14 flow offloading and was able to see an improvement (lantiq board with gigabit ethernet used):

HEAD

net to client   95.2 Mbits/sec routing
client to net   109 Mbits/sec  routing

net to client   85.6 Mbits/sec NAT
client to net   96.2 Mbits/sec NAT


HEAD + FLOW_OFFLOADING

net to client   129 Mbits/sec routing
client to net   144 Mbits/sec routing

net to client   124 Mbits/sec NAT
client to net   144 Mbits/sec NAT
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=487#comment4564