Slower wifi connection on computer with Arch

Pk_JoA · 2015-03-09 15:44:18

Hello! I've been experiencing some issues with my wifi lately. The situation is as follows.

I have a TP-link USB dongle conected to my desktop computer. My laptop is just next to it. The computer is running Arch with this driver https://github.com/pvaret/rtl8192cu-fixes installed with DKMS. Laptop is just running almost stock Lubuntu.

The thing is, when I go to speedtest.net to test for the speed of my internet connection, laptop gives 40ms ping, 6.83mbps down and 0.74mbps up, which is not perfect but it is a lot closer to what my ISP promises than Arch, which is responding with at best 2mbps download speed and ping at ~800ms. This results have been consistent over time: desktop with Arch is always performing far worse than laptop with Lubuntu.

As I said, computers are right next to each other. Didn't seem to have this problem before. Is there any logical reason why this could be happening?

This is the output of iwconfig on desktop.

GladOS:~$ iwconfig
enp3s0    no wireless extensions.

enp0s29u1u5  IEEE 802.11bgn  ESSID:"No hay manteca"  Nickname:"<WIFI@REALTEK>"
          Mode:Managed  Frequency:2.462 GHz  Access Point: FC:F5:28:2E:49:37   
          Bit Rate:72.2 Mb/s   Sensitivity:0/0  
          Retry:off   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=83/100  Signal level=66/100  Noise level=0/100
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

lo        no wireless extensions.

Output of lsusb and lsmod on desktop:

GladOS:~$ lsusb
Bus 002 Device 005: ID 09da:9090 A4Tech Co., Ltd. XL-730K / XL-750BK / XL-755BK Mice
Bus 002 Device 004: ID 0458:4018 KYE Systems Corp. (Mouse Systems) 
Bus 002 Device 003: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 002: ID 0bc2:2321 Seagate RSS LLC 
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
GladOS:~$ lsmod
Module                  Size  Used by
cfg80211              453926  0 
pci_stub               12429  1 
vboxpci                23139  0 
vboxnetflt             27412  0 
vboxnetadp             25443  0 
vboxdrv               352602  3 vboxnetadp,vboxnetflt,vboxpci
nct6775                44060  0 
hwmon_vid              12388  1 nct6775
nls_iso8859_1          12461  1 
nls_cp437              16553  1 
vfat                   21231  1 
fat                    61984  1 vfat
fuse                   87410  5 
8192cu                521925  0 
uas                    21817  1 
mousedev               17272  0 
joydev                 17063  0 
snd_hda_codec_realtek    63196  1 
snd_hda_codec_generic    63087  1 snd_hda_codec_realtek
snd_hda_codec_hdmi     49263  1 
evdev                  21544  10 
coretemp               12820  0 
intel_rapl             17356  0 
radeon               1546803  3 
x86_pkg_temp_thermal    12951  0 
intel_powerclamp       17122  0 
ttm                    81779  1 radeon
snd_hda_intel          26387  5 
kvm                   426425  0 
eeepc_wmi              12600  0 
snd_hda_controller     26938  1 snd_hda_intel
snd_hda_codec         112621  5 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_intel,snd_hda_controller
drm_kms_helper         80985  1 radeon
snd_hwdep              17244  1 snd_hda_codec
snd_pcm                88785  4 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller
drm                   263481  6 ttm,drm_kms_helper,radeon
asus_wmi               22781  1 eeepc_wmi
sparse_keymap          12818  1 asus_wmi
led_class              12855  1 asus_wmi
crct10dif_pclmul       13394  0 
i2c_algo_bit           12744  1 radeon
crc32_pclmul           12915  0 
rfkill                 18867  3 cfg80211,asus_wmi
crc32c_intel           21809  0 
r8169                  80917  0 
hwmon                  12930  4 nct6775,coretemp,radeon,asus_wmi
ghash_clmulni_intel    12978  0 
iTCO_wdt               12831  0 
snd_timer              26614  1 snd_pcm
iTCO_vendor_support    12649  1 iTCO_wdt
snd                    73436  18 snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel
mac_hid                12633  0 
mii                    12675  1 r8169
ppdev                  16782  0 
psmouse               107442  0 
aesni_intel           167997  0 
pcspkr                 12595  0 
soundcore              13031  2 snd,snd_hda_codec
aes_x86_64             16719  1 aesni_intel
mei_me                 17941  0 
mei                    75336  1 mei_me
lrw                    12757  1 aesni_intel
gf128mul               12970  1 lrw
serio_raw              12849  0 
glue_helper            12649  1 aesni_intel
ablk_helper            12572  1 aesni_intel
cryptd                 18553  3 ghash_clmulni_intel,aesni_intel,ablk_helper
i2c_i801               16965  0 
wmi                    17339  1 asus_wmi
i2c_core               50152  5 drm,i2c_i801,drm_kms_helper,i2c_algo_bit,radeon
button                 12953  0 
tpm_infineon           16882  0 
tpm_tis                17182  0 
tpm                    31467  2 tpm_tis,tpm_infineon
shpchp                 35210  0 
thermal                17559  0 
ie31200_edac           12567  0 
parport_pc             26351  0 
parport                35749  2 ppdev,parport_pc
edac_core              47176  1 ie31200_edac
video                  18043  1 asus_wmi
battery                17452  0 
lpc_ich                20768  0 
processor              27777  0 
fan                    12726  0 
sch_fq_codel           17343  6 
ext4                  510292  3 
crc16                  12343  1 ext4
mbcache                17171  1 ext4
jbd2                   86379  1 ext4
hid_generic            12393  0 
hid_kye                12532  0 
usbhid                 48595  0 
hid                   106316  3 hid_generic,hid_kye,usbhid
sd_mod                 43575  8 
ata_generic            12490  0 
pata_acpi              12771  0 
usb_storage            60311  1 uas
atkbd                  22254  0 
libps2                 12739  2 atkbd,psmouse
ata_piix               33592  4 
libata                181518  3 pata_acpi,ata_generic,ata_piix
xhci_pci               12675  0 
scsi_mod              147580  4 uas,usb_storage,libata,sd_mod
ehci_pci               12512  0 
xhci_hcd              152471  1 xhci_pci
ehci_hcd               69939  1 ehci_pci
usbcore               199382  8 uas,usb_storage,ehci_hcd,ehci_pci,usbhid,8192cu,xhci_hcd,xhci_pci
usb_common             12561  1 usbcore
i8042                  18002  1 libps2
serio                  18282  6 serio_raw,atkbd,i8042,psmouse

This on laptop:

Eowyn:~$ iwconfig
eth0      no wireless extensions.

lo        no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:"No hay manteca"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: FC:F5:28:2E:49:37   
          Bit Rate=65 Mb/s   Tx-Power=27 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=63/70  Signal level=-47 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:6  Invalid misc:1501   Missed beacon:0

Last edited by Pk_JoA (2015-03-09 17:41:43)

frank604 · 2015-03-09 16:17:36

What about lsusb and lsmod?

Pk_JoA · 2015-03-09 16:21:30

post edited to include information requested

frank604 · 2015-03-09 18:08:34

Does the Ubuntu port you installed work better than the aur pkgbuild at https://aur.archlinux.org/packages/8192cu-dkms/

progandy · 2015-03-09 20:39:17

Can you please compare the speed of the laptop and the desktop while using the tp-link dongle both times?

Edit: By the way, rtl8192cu is in kernel 3.19, maybe that is more stable. If you feel adventurous you might try that or a compile 3.18 with backports.

Last edited by progandy (2015-03-09 21:00:36)

Arch Linux

#1 2015-03-09 15:44:18

Slower wifi connection on computer with Arch

#2 2015-03-09 16:17:36

Re: Slower wifi connection on computer with Arch

#3 2015-03-09 16:21:30

Re: Slower wifi connection on computer with Arch

#4 2015-03-09 18:08:34

Re: Slower wifi connection on computer with Arch

#5 2015-03-09 20:39:17

Re: Slower wifi connection on computer with Arch

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