Ping reply times raise massively if creating WiFi traffic

[achel4ever]

Hello forum,
I've got a very weird problem with my WiFi connection. At home I can connect to my router, everything works fine.
At work I can connect to the router without any problem, just when I create traffic, the connection goes crazy.
If I constantly ping the router: after connecting I get reply times from 2-8 ms which seems quite fine to me. Now, as soon as I open my browser and type whatever address (internet or the IP of my router) the ping reply times immediately raise to 3000-8000 ms Sometimes the times drop again for a while, which makes webpages loading very very slow and very irregular (but working.)
Closing the browser won't bring the high reply times back to normal (they sometimes drop though to 500-2000 ms) Switch off and on the WiFi (software or hardware) and everything is fine again until I try again to create some traffic.

Other colleagues (all using windows) don't have any problems using the router or the internet.

Anybody got any idea what I can do to try solve this problem?
Thanks for your help

Robin

[SteveRiley]

It would help if we knew what kind of wi-fi interface you have, and which kernel module is loaded for it.

lspci -k

[achel4ever]

Thanks for your reply.
Here the output of lspci -k

00:00.0 Host bridge: Intel Corporation Ivy Bridge DRAM Controller (rev 09)
        Subsystem: Dell Device 053f
        Kernel driver in use: agpgart-intel
00:01.0 PCI bridge: Intel Corporation Ivy Bridge PCI Express Root Port (rev 09)
        Kernel driver in use: pcieport
        Kernel modules: shpchp
00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09)
        Subsystem: Dell Device 053f
        Kernel driver in use: i915
        Kernel modules: i915
00:14.0 USB controller: Intel Corporation Panther Point USB xHCI Host Controller (rev 04)
        Subsystem: Dell Device 053f
        Kernel driver in use: xhci_hcd
00:16.0 Communication controller: Intel Corporation Panther Point MEI Controller #1 (rev 04)
        Subsystem: Dell Device 053f
        Kernel driver in use: mei
        Kernel modules: mei
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
        Subsystem: Dell Device 053f
        Kernel driver in use: e1000e
        Kernel modules: e1000e
00:1a.0 USB controller: Intel Corporation Panther Point USB Enhanced Host Controller #2 (rev 04)
        Subsystem: Dell Device 053f
        Kernel driver in use: ehci_hcd
00:1b.0 Audio device: Intel Corporation Panther Point High Definition Audio Controller (rev 04)
        Subsystem: Dell Device 053f
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd-hda-intel
00:1c.0 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 1 (rev c4)
        Kernel driver in use: pcieport
        Kernel modules: shpchp
00:1c.1 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 2 (rev c4)
        Kernel driver in use: pcieport
        Kernel modules: shpchp
00:1c.2 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 3 (rev c4)
        Kernel driver in use: pcieport
        Kernel modules: shpchp
00:1c.3 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 4 (rev c4)
        Kernel driver in use: pcieport
        Kernel modules: shpchp                                                                                                 
00:1c.7 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 8 (rev c4)
        Kernel driver in use: pcieport
        Kernel modules: shpchp
00:1d.0 USB controller: Intel Corporation Panther Point USB Enhanced Host Controller #1 (rev 04)
        Subsystem: Dell Device 053f
        Kernel driver in use: ehci_hcd
00:1f.0 ISA bridge: Intel Corporation Panther Point LPC Controller (rev 04)
        Subsystem: Dell Device 053f
        Kernel modules: iTCO_wdt
00:1f.2 RAID bus controller: Intel Corporation 82801 Mobile SATA Controller [RAID mode] (rev 04)
        Subsystem: Dell Device 053f
        Kernel driver in use: ahci
00:1f.3 SMBus: Intel Corporation Panther Point SMBus Controller (rev 04)
        Subsystem: Dell Device 053f
        Kernel modules: i2c-i801
01:00.0 VGA compatible controller: NVIDIA Corporation Device 11be (rev a1)
        Subsystem: Dell Device 153f
        Kernel modules: nouveau, nvidiafb
03:00.0 Network controller: Intel Corporation Centrino Ultimate-N 6300 (rev 35)
        Subsystem: Intel Corporation Centrino Ultimate-N 6300 3x3 AGN
        Kernel driver in use: iwlwifi
        Kernel modules: iwlwifi
0c:00.0 FireWire (IEEE 1394): O2 Micro, Inc. 1394 OHCI Compliant Host Controller (rev 05)
        Subsystem: Dell Device 053f
        Kernel driver in use: firewire_ohci
        Kernel modules: firewire-ohci
0c:00.1 SD Host controller: O2 Micro, Inc. Integrated MMC/SD controller (rev 05)
        Subsystem: Dell Device 053f
        Kernel driver in use: sdhci-pci
        Kernel modules: sdhci-pci

[SteveRiley]

Your computer contains Intel wi-fi, which is far superior to all other wi-fi in Linux. So that eliminates one potential source of problems.

Next: I suspect your router is probably configured to use a very large frequency band to obtain the marketing-department-manded super-mega-ultra speeds printed on the box. These are entirely artificial and serve no practical purpose in the real world, given that the incoming WAN bandwidth from your ISP is likely to be much lower. What brand and model wi-fi router do you have?

[achel4ever]

Sorry for my late reply, had a few days off.
The router is a very simple D-link DIR 605. Only a password to access Wifi is set, all other settings are default. I can access the router settings, since it is not password protected

[SteveRiley]

Somewhere in the configuration, you should find a way to adjust the wireless bandwidth. It's probably set to "automatic" or something similar. Change it to 20 MHz. You also might need to experiment with channel assignments -- is there a lot of other wi-fi in your vicinity?

Oh, and please put a password on the configuration page!

[achel4ever]

Somewhere in the configuration, you should find a way to adjust the wireless bandwidth. It's probably set to "automatic" or something similar. Change it to 20 MHz. You also might need to experiment with channel assignments -- is there a lot of other wi-fi in your vicinity?

Oh, and please put a password on the configuration page!

Changed the bandwidth to 20 Mhz, set channel to auto, and choose a few other values then 6 (default). Changed band to n, b/g, n/b/g. All without result.
The router belongs to a company that hires me, so I'm actually not even allowed to change the settings. But since there is no one else here who knows anything about it, they just let me, as long as their internet is working...

[SteveRiley]

Hm. You might need to consult the forums at Tom's Hardware or Small Net Builder, then. Typically, changing to 20 MHz fixes these problems and/or altering the channel fixes these kinds of problems.