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#1 2019-07-12 02:54:15

ansgoati
New Member
Registered: 2019-07-11
Posts: 2

Slow wifi connection

Hello.

I recently install Debian Buster. The firmware files that i needed to run wifi was brcm/bcm43xx-0.fw on package firmware-brcm80211 and rtl_nic/rtl8168d-2.fw package firmware-realtekthat are on non-free, now the wifi works but too slow. Also, after that I've installed the packages, on the boot process, this thing appears.

The output from systemctl was:

● ifupdown-pre.service - Helper to synchronize boot up for ifupdown
   Loaded: loaded (/lib/systemd/system/ifupdown-pre.service; static; vendor preset: enabled)
   Active: failed (Result: exit-code) since Thu 2019-07-11 20:28:30 -05; 1h 6min ago
  Process: 257 ExecStart=/bin/sh -c if [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=lo)" ] && [ -x /bin/udevadm ]; then udevadm settle; fi (code=exited, status=1/FAILURE)
 Main PID: 257 (code=exited, status=1/FAILURE)

don't know what happens here.

By the speed question i followed this post, only the options iwlwifi 11n_disable=1 option increase just a tiny bit the speed but still extremely slow.

lspci output:

lspci -knn | grep Net -A2 && uname -a 
12:00.0 Network controller [0280]: Broadcom Limited BCM4313 802.11bgn Wireless Network Adapter [14e4:4727] (rev 01)
	Subsystem: Dell Inspiron M5010 / XPS 8300 [1028:0010]
	Kernel driver in use: bcma-pci-bridge
Linux surface80 4.19.0-5-amd64 #1 SMP Debian 4.19.37-5 (2019-06-19) x86_64 GNU/Linux

I do not know what other information to add.
Thanks for your help.

Last edited by ansgoati (2019-07-12 03:08:07)

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#2 2019-07-18 03:58:53

mrjcsh
Member
Registered: 2019-07-18
Posts: 7

Re: Slow wifi connection

Not entirely sure about the precise cause, though good points to consider. Try fluctuating the limit of memory used by your network stack. Smaller memory values will cause garbage collecting functions to happen more often(less time spent on each iteration in cleaning stuff up). Have a good read on the 'net.ipv4.tcp_slow_start_after_idle' and really consider the over all affect icmp black holes have on tcp streams, and mtu probing.

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#3 2019-07-23 15:44:38

ansgoati
New Member
Registered: 2019-07-11
Posts: 2

Re: Slow wifi connection

I solve the wifi problem. First i've install netselect-apt to choose a fast mirror. Then i've install broadcom-sta-dkms, broadcom-sta-common and reboot. Now wifi works well.

Still can't know what's the "ifupdown" problem, i have to wait 2 minutes on every boot.

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