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SOLVED: The problem was most likely caused by a temporarily malfunctioning router. It was just a matter of unlucky timing that the issue didn't show itself on Windows and initially seemed to be related to suspend to RAM on Arch.
Update: The speed just dropped without putting the system to sleep after reboot. It now persists even after shutting down the system. (There is no other Wi-Fi traffic that could be the cause.)
Here's what I do:
Reboot.
wget http://mirror.nl.leaseweb.net/archlinux/core/os/x86_64/linux-3.9.8-1-x86_64.pkg.tar.xzSee that download speed is around 1400 KB/s.
systemctl suspendResume.
wget http://mirror.nl.leaseweb.net/archlinux/core/os/x86_64/linux-3.9.8-1-x86_64.pkg.tar.xzSee that download speed is around 40 KB/s.
netctl restart wlp2s0-my-networkwget http://mirror.nl.leaseweb.net/archlinux/core/os/x86_64/linux-3.9.8-1-x86_64.pkg.tar.xzSee that download speed is around 1400 KB/s.
This happens regardless of the server. For example I also tried: http://speedtest.london.linode.com/100MB-london.bin
Before and after suspend to RAM, the Wi-Fi is connected at 36-48 Mb/s.
Wi-Fi card is an Intel Centrino Advanced-N 6205.
Here's what packages I have installed:
Linux 3.9.8-1
systemd 204-3
linux-firmware 20130610-1
(An old, similar post with another Wi-Fi card.)
This problem doesn't seem to occur on Windows.
Last edited by Markus00000 (2013-07-04 12:32:42)
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iwconfig wlp3s0 power off
do you have some app to save battery
i think it set wifi card to save power when going to sleep
try to do iwconfig before and after sleep, post log.
also post dmesg log
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Please note my little update above because the problem just occurred directly after reboot and could no longer be fixed by reconnecting the Wi-Fi.
iwconfig wlp3s0 power off
This makes no difference whether on or off.
do you have some app to save battery
Yes, laptop-mode-tools 1.63-3. The problem occurs even when it is disabled.
i think it set wifi card to save power when going to sleep
try to do iwconfig before and after sleep, post log.
iwconfig output is (practically) the same before and after sleep:
wlp2s0 IEEE 802.11abgn ESSID:"my-network"
Mode:Managed Frequency:2.462 GHz Access Point: 00:15:0C:F5:9A:1B
Bit Rate=36 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=30/70 Signal level=-78 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:5 Missed beacon:0also post dmesg log
I hope these are all relevant parts (otherwise I'll post more). This is the output directly after booting where the problem was already present:
[ 4.075453] systemd[1]: Expecting device sys-subsystem-net-devices-wlp2s0.device...
...
[ 4.239276] Intel(R) Wireless WiFi driver for Linux, in-tree:
[ 4.239279] Copyright(c) 2003-2013 Intel Corporation
[ 4.239352] iwlwifi 0000:02:00.0: enabling device (0000 -> 0002)
[ 4.239560] e1000e 0000:00:19.0: setting latency timer to 64
[ 4.239701] e1000e 0000:00:19.0: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
[ 4.240178] e1000e 0000:00:19.0: irq 44 for MSI/MSI-X
[ 4.240180] ACPI: AC Adapter [AC] (on-line)
[ 4.240410] iwlwifi 0000:02:00.0: irq 43 for MSI/MSI-X
[ 4.244402] iwlwifi 0000:02:00.0: loaded firmware version 18.168.6.1
[ 4.264522] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEBUG disabled
[ 4.264526] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEBUGFS disabled
[ 4.264528] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled
[ 4.264529] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_DEVICE_TESTMODE disabled
[ 4.264531] iwlwifi 0000:02:00.0: CONFIG_IWLWIFI_P2P disabled
[ 4.264533] iwlwifi 0000:02:00.0: Detected Intel(R) Centrino(R) Advanced-N 6205 AGN, REV=0xB0
[ 4.264650] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
[ 4.299983] ieee80211 phy0: Selected rate control algorithm 'iwl-agn-rs'
...
[ 4.832348] systemd-udevd[164]: renamed network interface wlan0 to wlp2s0
...
[ 6.244490] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
[ 6.251857] iwlwifi 0000:02:00.0: Radio type=0x1-0x2-0x0
[ 6.343774] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
[ 6.625074] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
[ 6.631796] iwlwifi 0000:02:00.0: Radio type=0x1-0x2-0x0
[ 6.703892] EXT4-fs (sda4): mounted filesystem with ordered data mode. Opts: data=ordered
[ 6.823827] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
[ 7.181948] atkbd serio0: Spurious ACK on isa0060/serio0. Some program might be trying to access hardware directly.
[ 10.045379] wlp2s0: authenticate with 00:15:0c:f5:9a:1b
[ 10.048816] wlp2s0: send auth to 00:15:0c:f5:9a:1b (try 1/3)
[ 10.050885] wlp2s0: authenticated
[ 10.051032] iwlwifi 0000:02:00.0 wlp2s0: disabling HT as WMM/QoS is not supported by the AP
[ 10.051039] iwlwifi 0000:02:00.0 wlp2s0: disabling VHT as WMM/QoS is not supported by the AP
[ 10.054105] wlp2s0: associate with 00:15:0c:f5:9a:1b (try 1/3)
[ 10.060448] wlp2s0: RX AssocResp from 00:15:0c:f5:9a:1b (capab=0x411 status=0 aid=2)
[ 10.065056] wlp2s0: associated
[ 10.065103] IPv6: ADDRCONF(NETDEV_CHANGE): wlp2s0: link becomes readyOffline