Ubuntu – Slow WiFi since updating to 18.04

internetnetworkingwireless

I've had some weird internet issues since upgrading.

First of all, my wifi USB dongle stopped working so I thought it was broken, I replaced it and was getting speeds of under 1 Mbps.

Since then I have had very poor download speeds, and surfing has been a bit hit and miss with some sites loading instantly, and others crawling. everything was fine using the same hardware on 16.04

What can I do to speed things up?

Thanks!

Best Answer

I just fixed this on ubuntu 18.04 - turns out there is some kind of issue with 802.11n and iwlwifi Intel chips. The solution is to turn it off.
Check if it works first with:

sudo modprobe -r iwlwifi

sudo modprobe iwlwifi 11n_disable=1

Make it permanent with this command:

echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf

I did this and my wifi speeds instantly went back to normal.

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Ubuntu – Samba Ubuntu 20.04 -> Windows slow transfer speeds

Try these samba tweaks to see if you can improve your transfer speed, I used them and I can transfer from my Windows PC to my Linux Server a file about 1GB in size in a bout 1 min or less over WiFi.

#Backup original settings
sudo cp /etc/samba/smb.conf /etc/samba/smb.conf.orig

#Open file to apply samba speed tweaks
sudo nano /etc/samba/smb.conf

#Locate and change the following lines in smb.conf
read raw = Yes
write raw = Yes
socket options = TCP_NODELAY IPTOS_LOWDELAY SO_SNDBUF=8192 SO_RCVBUF=8192
min receivefile size = 16384
use sendfile = true
aio read size = 16384
aio write size = 16384

Don't forget to save and close the file after you edit the above section.

For the socket option, you can also try these settings to compare which works best for you:

socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=131072 SO_SNDBUF=131072

Best Answer

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Ubuntu – Samba Ubuntu 20.04 -> Windows slow transfer speeds

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