Also tried /etc/modprobe.d/options.conf with the setting as stated below; 
still minstrel is used... weird.

----- Original Message ----- 
From: "Ernst J. Oud" <ernst...@euronet.nl>
To: "Hin-Tak Leung" <hintak_le...@yahoo.co.uk>; 
<zd1211-devs@lists.sourceforge.net>
Sent: Saturday, February 13, 2010 11:21 PM
Subject: Re: [zd1211-devs] Problem with MTU > 500


> Ok. I tried, apparantly modprobe.conf is deprecated. So, I created
> /etc/modprobe.d/mac80211.conf with:
>
>    options mac80211 ieee80211_default_rc_algo=pid
>
> but that doesn't work; dmesg still shows minstrel is used.
>
> Putting the same line in modprobe.conf gives the same result; minstrel is
> still used.
>
> Bit of a newbie here; never changed modprobe.conf, so I am unsure whether
> adding anything to that file still works since it is deprecated and if not
> what the filename in /etc/modprobe.d/ should be...
>
> Perhaps it helps to know that the iwconfig output is also rather minimal:
>
> wlan0     IEEE 802.11bg  ESSID: [esside deleted]
>          Mode:Managed  Frequency:2.437 GHz  Access Point: [mac address
> deleted]
>          Bit Rate=1 Mb/s   Tx-Power=20 dBm
>          Retry  long limit:7   RTS thr:off   Fragment thr:off
>          Encryption key: [key deleted]
>          Power Management:off
>          Link Quality:0  Signal level:0  Noise level:0
>          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>          Tx excessive retries:0  Invalid misc:0   Missed beacon:0
>
> So no link quality, signal level and noise level indicated and the Bit 
> Rate
> is not correct; I get speeds that fit with 24 Mb/s or higher...
>
> So something weird is happening with this setup here.
>
> Relevant part of dmesg (mac address of AP masked):
>
> usb 1-1: reset high speed USB device using ehci_hcd and address 2
> phy0: Selected rate control algorithm 'minstrel'
> zd1211rw 1-1:1.0: phy0
> usbcore: registered new interface driver zd1211rw
> usb 1-1: firmware: requesting zd1211/zd1211b_ub
> usb 1-1: firmware: requesting zd1211/zd1211b_uphr
> zd1211rw 1-1:1.0: firmware version 4725
> zd1211rw 1-1:1.0: zd1211b chip 0ace:1215 v4810 high 00-25-86 MAXIM_NEW_RF
> pa0 -7---
> cfg80211: Calling CRDA for country: DE
> wlan0: direct probe to AP --:--:--:--:--:-- (try 1)
> wlan0: direct probe responded
> wlan0: authenticate with AP --:--:--:--:--:-- (try 1)
> wlan0: authenticated
> wlan0: associate with AP --:--:--:--:--:-- (try 1)
> wlan0: RX AssocResp from --:--:--:--:--:-- (capab=0x411 status=0 aid=4)
> wlan0: associated
>
> Any clues?
>
> TIA
>
> Ernst
>
> ----- Original Message ----- 
> From: "Hin-Tak Leung" <hintak_le...@yahoo.co.uk>
> To: <zd1211-devs@lists.sourceforge.net>; "Ernst J. Oud"
> <ernst...@euronet.nl>
> Sent: Saturday, February 13, 2010 9:47 PM
> Subject: Re: [zd1211-devs] Problem with MTU > 500
>
>
> Hmm, the default(?) is 1500 - MTU=500 is way too low for normal usage.
>
> since zd1211rw is also a mac80211 driver, can you give the pid 
> modprobe.conf
> a try to see if it helps? See
> http://bugzilla.kernel.org/show_bug.cgi?id=14168
>
> --- On Sat, 13/2/10, Ernst J. Oud <ernst...@euronet.nl> wrote:
>
>> L.S.
>>
>> I am running Slackware 13.0 (kernel 2.6.32) on an RDC
>> (=i486 compatible)
>> small embedded system and using a ZD1211b usb stick for
>> wlan (client) access
>> using the standard zd1211rw (module). Firmware version is
>> 1.4
>>
>> This works fine as long as I specify an MTU
>> smaller than 500 for
>> wlan0.
>>
>> With a larger MTU the connection aborts when sending
>> larger amounts of
>> information, for instance in a telnet session doing an ls
>> of a large directory.
>> I can log in and I can do an ls on a small
>> directory...
>>
>> This is not an USB WLAN stick problem; I tried three
>> separate sticks from
>> different vendors and they all exhibit this problem.
>>
>> With an MTU of say 448, wlan speed is half of what it
>> could be so any help
>> would be appreciated.
>>
>> TIA
>>
>> Ernst
>
>
>
>
>
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