Bug#884426: Wifi speeds of Debian 9 (Stretch) are 2-3 times slower than Debian 8 (Jessie)
Package: firmware-iwlwifi
Version: 20161130-3
REPORT: Debian 8 (Jessie)
1) The Jessie wifi package is 'firmware-iwlwifi' version 0.43
2) Linux kernel = 3.16.0.4-amd64 #1 SMP Debian 3.16.51-2 (2017-12-03)
x86_64 GNU/Linux
3) C library version = 2.19-18+deb8u10
When using Debian 8 (Jessie) fresh after GNOME install, wifi speeds are
measured at 150Mbps download on N network using the Intel Centrino
Ultimate-N 6300 wireless card (on a ThinkPad X220 with 3 antennas).
After setting the '11n_disable=8' parameter (as exampled immediately
below), speeds increased to 200Mbps download.
$ sudo nano /etc/modprobe.d/iwlwifi.conf
options iwlwifi 11n_disable=8
REPORT: Debian 9 (Stretch)
1) The Stretch wifi package is 'firmware-iwlwifi' version 20161130-3
2) Linux kernel = 4.9.0-4-amd64 #1 SMP Debian 4.9.65-3 (2017-12-03)
x86_64 GNU/Linux
3) C library version = 2.24-11+deb9u1
When using Debian 9 (Stretch) fresh after GNOME install, wifi speeds are
measured at around 50 Mbps download on N network using the Intel
Centrino Ultimate-N 6300 wireless card (on a ThinkPad X220 with 3
antennas). After setting the '11n_disable=8' parameter (as exampled
immediately below), speeds increased to around 100Mbps download.
$ sudo nano /etc/modprobe.d/iwlwifi.conf
options iwlwifi 11n_disable=8
The system used for testing was a Lenovo ThinkPad X220. Stretch and
Jessie were both run on identical hardware connecting to the same access
point produced by a router running LEDE. Debian Stretch wifi is
significantly slower than Debian Jessie wifi. Hopefully something can be
done to improve the wifi speed of Debian Stretch but also to make sure
that the wifi speeds of Debian Buster can be improved before it is
released as stable.
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