2010-10-01 22:34:31

by Saqeb Akhter

[permalink] [raw]
Subject: Re: carl9170: wnda3100 only 54MB/s

Below is the out put from iperf on windows (about 3x faster).

Not sure what to do to get better throughput...is this considered a
bug or a lacking feature ?

It looks like its maxing out at 54MB/s on a 5Ghz AP, makes me wonder
if its using 802.11a, in lieu of 802.11n ?

-------------------------------------------------------------------------------
------------------------------------------------------------
Client connecting to 192.168.10.52, TCP port 5001
TCP window size: 63.0 KByte (default)
------------------------------------------------------------
[148] local 192.168.10.60 port 50087 connected with 192.168.10.52 port 5001
[ ID] Interval ? ? ? Transfer ? ? Bandwidth
[148] ?0.0-10.0 sec ?76.0 MBytes ?63.7 Mbits/sec ?(Windows 7)

-------------------------------------------------------------------------------
------------------------------------------------------------
Client connecting to 192.168.10.52, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ ?3] local 192.168.10.60 port 42587 connected with 192.168.10.52 port 5001
[ ID] Interval ? ? ? Transfer ? ? Bandwidth
[ ?3] ?0.0-10.0 sec ?25.5 MBytes ?21.3 Mbits/sec (Ubuntu)

-------------------------------------------------------------------------------
sakhter@sakhter-laptop:~$ iw dev wlan2 link
Connected to 30:46:9a:10:49:f7 (on wlan2)
? ?SSID: sakhter-5g
? ?freq: 5200
? ?RX: 222040 bytes (949 packets)
? ?TX: 12082 bytes (77 packets)
? ?signal: -45 dBm
? ?tx bitrate: 54.0 MBit/s

> On Fri, Oct 1, 2010 at 10:36 AM, Christian Lamparter
> <[email protected]> wrote:
>>
>> On Friday 01 October 2010 16:22:45 Saqeb Akhter wrote:
>> > Hey Guys,
>> >
>> > I just got around to compiling compat-wireless on ubuntu 10.04, to
>> > make use of the new carl9170 driver which is supposed to be able to
>> > handle 802.11n.
>> >
>> > My router is a wndr3700 running @ 5ghz on windows I'm able to get
>> > pretty good speeds. But on Ubuntu it does not seem to connect faster
>> > than 54MB/s, iwlist scan shows that 54Mb/s is the highest it can go.
>> sure, that's a limitation of iwlist. If you want to know the current
>> link speed (link speed as in "the last used tx rate", so if there's
>> no traffic then the rate is low) you should be using the "iw" utility:
>>
>> iw dev wlanX link
>>
>> Regards,
>> ? ? ? ?Chr
>
>