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Re: Speed up a WiFI interface ??

On Tue, Dec 30, 2014 at 07:14:19PM +0100, Bernhard Frühmesser wrote:
> Hello,
> For a friend i setup a small RAID-1 config using Wheezy on one of his old
> machines, just to backup his most important stuff. Unfortunately the
> location where the box is placed can not be reached via cable because of
> building conditions, so only Wireless is possible.
> I have installed package "firmware-ralink" for the network card and these
> modules are loaded after reboot:
> rt2800pci
> rt2800lib
> rt2x00pci
> After using wpa_passphrase and adding wlan0 to /etc/network/interfaces all
> works so far, the client get´s an ip from the dhcp server, can copy stuff
> and so on.
> The Problem is that it´s extremely slow.
> The WLAN-Router is setup to support 11bgn mixed mode, channel bandwith
> "audo" and max transfer rate 150Mbit/s.
> But when i check the client side with iwconfig i get this:
> wlan0     IEEE 802.11bgn  ESSID:"My friends SSID"
>           Mode:Managed  Frequency:2.462 GHz  Access Point:MAC-Adress
>           Bit Rate=58.5 Mb/s   Tx-Power=20 dBm
>           Retry  long limit:7   RTS thr:off   Fragment thr:off
>           Encryption key:off
>           Power Management:off
>           Link Quality=45/70  Signal level=-65 dBm
>           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>           Tx excessive retries:5788  Invalid misc:58   Missed beacon:0
> The wlan-card is supposed to support 150Mbit/s as well.
> I have tested and position the box right next to the wlan-Router but this
> doesn´t help much except the Link Quality is then 70/70.
> I have used iptraf to check for the data rates and the overall input rate
> for this interface is about 5,8 Mbit/s which is not even 5% of the max
> (theoretical) speed. I know that the max speed of a WLAN is never reached
> but 5,8 Mbit/s overall speed seems very slow to me - no?
> Anything i can do to speed this up?
> Thanks,
> BF.
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Megabits are not the same as megabytes. Eight bits in byte + start/stop and overheads.

150Mb is probably closer to 150/10MB - so 150Mb = 15MB in ideal conditions without any loss.

Add in radio noisy environments / other interference and you can soon lose speed :(

All the best,


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