Linksys EA6350(v3) Tethering USB 3.0 Speed

Hardware Questions and Recommendations
1

Hi all,
I would like to ask for suggestions.
I am currently using Linksys EA6350(v3) + Moto G50 + usb3.0 cable (Bought from Amazon)

I am with Smarty in the UK and is always 5G connection.
I followed this page for the mobile tethering installation.

The other thing I did not follow exactly the same is instead of installing kmod-usb2 I installed kmod-usb3 as the router has a USB3 port.

So when I use mobile to test the speed from speedtest.net I get around 500Mbps but when I use usb tethering with the router I only get max. 100Mbps with the same testing server.

I am aware of the speed loss when using USB tethering but USB 3.0 does not seem to be helping.

Does anyone have suggestions?

3

Check that the phone is actually linking in USB3 mode. You should see "super speed USB device" in the log when plugging in / starting up the tether.

Check router CPU usage during a speed test. I don't know if tethering will use multiple cores effectively.

4

Thanks for your reply. Surprisingly, it's using usb 2.0 if i am correct?

Log:
Mon Aug 8 13:00:58 2022 kern.info kernel: [55.840123] usb 1-1: new high-speed USB device number 3 using xhci-hcd

Do you have ideas why it's doing that as I am already using a usb3.0 max 5Gbps cable?

CPU usage during speed test is
Owner:root Command:[ksoftirqd/0] CPU: max. 23% Memory:0%

5

Yes, "high speed" means USB2. Plug in something else that is definitely USB3.

23% CPU usage looks suspiciously like one of the 4 cores is being maxed while the others are idle. Is irqbalance active?

6

Moto G50 only supports USB 2.0 speeds.

1 Like
7

You are right. Yes, After all investigation it is USB 2.0 but it's still faster/cheaper then my home broadband so will keep it as it is.

8

I have activated irqbalance now and I can see CPU0 and CPU1 are being used (by using this command -> cat /proc/interrupts) but not 2 and 3 but like @mk24 said the mobile itself is usb2.0 so probably that's why I am not getting higher than 100Mbps. I know the max for USB 2.0 is 480Mbps but I imagine that's the Lalaland scenario.


         CPU0        CPU1          CPU2         CPU3
 94:     251527     446833          0          0     GIC-0 164 Level     xhci-hcd:usb1
 95:          0          0          0          0     GIC-0 168 Level     xhci-hcd:usb3
1 Like
9

What can be done is using usb 2 (tether) and wifi hotspot from the mobile as wan and aggregating them with mwan3.

10

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