From: Juan Carlos Garza <juancarlosgarza@gmail.com>
To: Luis Correia <luis.f.correia@gmail.com>
Cc: linux-wireless@vger.kernel.org
Subject: Re: rt2800usb (rt2x00) in ad-hoc mode stalls when transferring large amount of data
Date: Fri, 11 Mar 2011 21:19:29 +0100 [thread overview]
Message-ID: <AANLkTimES4LLH9MT459RGc+2XUZ2csOLRnxWd4dws5mQ@mail.gmail.com> (raw)
In-Reply-To: <AANLkTimfy87qCY7m-5YzBpqLTQKakf1zLMxCGNvotjO3@mail.gmail.com>
On Fri, Mar 11, 2011 at 9:08 PM, Luis Correia <luis.f.correia@gmail.com> wrote:
> Hi
>
> On Fri, Mar 11, 2011 at 20:04, Juan Carlos Garza
> <juancarlosgarza@gmail.com> wrote:
>> Hello
>>
>> I have a Ralink 3071 usb device (Bus 002 Device 003: ID 07b8:3071
>> D-Link Corp. 802.11n/b/g Mini Wireless LAN USB2.0 Adapter).
>> I am using the mac80211 driver by compiling the compat-wireless
>> tarball from yesterday (10 March). I cross compile it with the 2.6.24
>> kernel in a Montavista distribution (and also with 2.6.27 in Fedora)
>>
>> It works pretty good in AP mode using HostAPD and DCHP and I get
>> relative good transfer rates (up to 3.5 MBytes per second).
>>
>> My problems are with Ad-Hoc connections. I can configure the Ad-Hoc
>> connection, for example:
>>
>> iwconfig wlan0 mode ad-hoc
>> iwconfig wlan0 essid my_ad_hoc_nt
>> iwconfig wlan0 key 1122334455
>> ifconfig wlan0 192.168.111.44 up
>>
>> It works and I connect to it on the other end (a windows machine with
>> a compatible static ip address), however, it only works for doing
>> small data transfer rate things like browsing through the directories
>> of a shared folder or retrieving web pages from a web server. When I
>> try to do something like transferring a 500 MByte file, it starts
>> transferring, reaches a peak and then it drops to 0 again. After that,
>> the file is no longer transferred and I cannot do anything else (can't
>> ping).
>>
>> Is this a known issue? Any ideas?
>>
>> Juan Carlos
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>
> keep in mind that current (and by design) ad-hoc connections max out at 11Mb.
Thanks for the comment,
Mhh, I've been benchmarking some other chipsets in ad-hoc mode (like
the rtl8188cus) and they do not present these problems (only a slow
transfer rate).
>
> there may be some buffer bottleneck involved.
>
I tried changing the MTU and other parameters, and nothing...
> but I'm not a very good expert on this subject.
>
>
> Luis Correia
>
--
________________________________
M.Sc. Juan Carlos Garza Fernández
Chistophstr. 14
70178 Stuttgart, Deutschland
+49 711 4080769
+49 176 21947676
juancarlosgarza@gmail.com
________________________________
prev parent reply other threads:[~2011-03-11 20:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-11 20:04 rt2800usb (rt2x00) in ad-hoc mode stalls when transferring large amount of data Juan Carlos Garza
2011-03-11 20:08 ` Luis Correia
2011-03-11 20:19 ` Juan Carlos Garza [this message]
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