Your message dated Mon, 27 Feb 2017 11:17:01 +0000
with message-id <[email protected]>
and subject line Re: network-manager: Wireless connection frequently stalls (on
background network scan?)
has caused the Debian Bug report #742180,
regarding network-manager: Wireless connection frequently stalls (on background
network scan?)
to be marked as done.
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--
742180: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742180
Debian Bug Tracking System
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--- Begin Message ---
Package: network-manager
Version: 0.9.8.0-5
Severity: normal
Dear Maintainer,
my wireless connections frequently stall for around a second (i.e., no packages
go through).
This can be reproduced with the following two test cases:
* Download a large file via wget. Observe that pretty precisely every 2
minutes, the
download bandwith drops to 0 for around a second, then it goes back up again.
* Run "ping ct.de" (or any other host, of course).
Observe that pretty precisely every 2 minutes, the ping time goes up
significantly:
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=510 ttl=247
time=22.2 ms
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=511 ttl=247
time=62.2 ms
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=512 ttl=247
time=254 ms
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=513 ttl=247
time=175 ms
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=514 ttl=247
time=101 ms
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=515 ttl=247
time=22.0 ms
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=516 ttl=247
time=21.8 ms
[ 120 ICMP packages later ]
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=629 ttl=247
time=22.5 ms
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=630 ttl=247
time=22.5 ms
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=631 ttl=247
time=261 ms
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=632 ttl=247
time=187 ms
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=633 ttl=247
time=108 ms
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=634 ttl=247
time=29.5 ms
64 bytes from redirector.heise.de (193.99.144.80): icmp_seq=636 ttl=247
time=23.4 ms
This is particularily annoying when using VoIP applications like Mumble or
TeamSpeak:
These connection stalls are audible as artifacts of the other speakers, and
similarily, the others only get artifacts from me at that time.
I suspect that the cause for these stalls are background network scans:
If I run something like
watch -n 20 "sudo /sbin/iw dev wlan0 scan"
I can see these stalls every 20 seconds.
I suspect it's NetworkManager doing the 2-minute background scan as this is
mentioned
in <https://bugzilla.gnome.org/show_bug.cgi?id=513820>. That thread (and some
others)
also mention that fixes for this would be underway in the kernel, but that was
three
years ago, so I suspect these fixes never came or did not work? I am not sure
whether this bug ought to be assigned to NetworkManager or to the kernel, so
I'd appreciate help in tracking down the cause of the issue, and the right place
to fix it.
Kind regards
Ralf
-- System Information:
Debian Release: jessie/sid
APT prefers testing
APT policy: (990, 'testing'), (100, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 3.13-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages network-manager depends on:
ii adduser 3.113+nmu3
ii dbus 1.8.0-2
ii isc-dhcp-client 4.2.4-7
ii libc6 2.18-4
ii libdbus-1-3 1.8.0-2
ii libdbus-glib-1-2 0.102-1
ii libgcrypt11 1.5.3-3
ii libglib2.0-0 2.38.2-5
ii libgnutls26 2.12.23-13
ii libgudev-1.0-0 204-7
ii libnl-3-200 3.2.21-1
ii libnl-genl-3-200 3.2.21-1
ii libnl-route-3-200 3.2.21-1
ii libnm-glib4 0.9.8.0-5
ii libnm-util2 0.9.8.0-5
ii libpolkit-gobject-1-0 0.105-4
ii libuuid1 2.20.1-5.6
ii lsb-base 4.1+Debian12
ii udev 204-7
ii wpasupplicant 1.1-1
Versions of packages network-manager recommends:
ii crda 1.1.2-1
ii dnsmasq-base 2.68-1
ii iptables 1.4.21-1
ii modemmanager 0.5.2.0-2.1
ii policykit-1 0.105-4
ii ppp 2.4.5+git20130610-4
Versions of packages network-manager suggests:
ii avahi-autoipd 0.6.31-4
-- Configuration Files:
/etc/NetworkManager/NetworkManager.conf changed:
[main]
plugins=ifupdown,keyfile
no-auto-default=10:BF:48:05:C7:F7,
[ifupdown]
managed=false
/etc/polkit-1/localauthority/10-vendor.d/org.freedesktop.NetworkManager.pkla
[Errno 13] Permission denied:
u'/etc/polkit-1/localauthority/10-vendor.d/org.freedesktop.NetworkManager.pkla'
-- no debconf information
--- End Message ---
--- Begin Message ---
Version: 0.8.2-1
Control: forwarded -1 https://bugzilla.gnome.org/show_bug.cgi?id=513820
On Thu, Mar 20, 2014 at 12:04:45PM +0100, Ralf Jung wrote:
> I suspect it's NetworkManager doing the 2-minute background scan as
> this is mentioned
> in <https://bugzilla.gnome.org/show_bug.cgi?id=513820>. That thread
> (and some others)
> also mention that fixes for this would be underway in the kernel, but
> that was three
> years ago, so I suspect these fixes never came or did not work? I am
> not sure
> whether this bug ought to be assigned to NetworkManager or to the
> kernel, so
> I'd appreciate help in tracking down the cause of the issue, and the
> right place
> to fix it.
You can inhibit scans by locking the connection to a particular AP's
BSSID.
<https://github.com/NetworkManager/NetworkManager/blob/master/src/devices/wifi/nm-device-wifi.c#L1306>
--
Sam Morris <https://robots.org.uk/>
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