Re: Trouble with Cisco Airo MPI350 and kernel-2.6.1+

[Fabrice Bellet <fabrice@bellet.info>]

Hi,

On Sun, Feb 01, 2004 at 11:30:00AM -1000, Warren Togami wrote:
> >>On Sun, Jan 25, 2004 at 07:48:57PM -1000, Warren Togami wrote:
> >>
> >>>IBM Thinkpad T41
> >>>Cisco Airo MPI350 802.11b Wireless
> >>>PCIID: 0x14b9  0xa504
> >>>Kernel: Fedora rawhide 2.6.1-1.57 (Based on 2.6.2-rc1)
> >>>
> >>>http://bellet.info/~bellet/laptop/t40.html#wireless
> >>>http://bellet.info/~bellet/laptop/airo.c-2.6.1-mm2.diff
> >>>airo.ko does not support this Airo device, but with the addition of 
> >>>this patch it recognizes the device.
> >>
> >>
> >>
> >[SNIP]
> >Used the ACU tool under Windows XP for flashing the firmware.  The 
> >newest firmware version that operates with your driver is:
> >5.00.03
> >
> >Perhaps mention within a comment and/or config Help of your patch that 
> >the newest supported firmware is 5.00.03?  That would save people like 
> >me a lot of time in the future...
> >
> 
> Are these many errors normal?
> 
[snip]
> 
> [root@ibmlaptop etc]# ifconfig eth1
> eth1      Link encap:Ethernet  HWaddr 00:02:8A:DF:50:FC
>           inet addr:192.168.1.103  Bcast:192.168.1.255  Mask:255.255.255.0
>           inet6 addr: fe80::202:8aff:fedf:50fc/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:905 errors:655 dropped:0 overruns:0 frame:655
>           TX packets:699 errors:33 dropped:0 overruns:0 carrier:0
>           collisions:30 txqueuelen:1000
>           RX bytes:439321 (429.0 Kb)  TX bytes:118979 (116.1 Kb)
>           Interrupt:11 Base address:0x8000

The "rx errors" value is generated by summing 4 error counters from the 
card internal stats structure in airo_read_stats() : 
     RxOverrun, RxPlcpFormatErr, RxPlcpLengthErr and RxMacCrcErr.

Altough my connection is up and running, I also observe a high rate of 
RxMacCrcErr errors :

% grep MacCrc /proc/driver/aironet/eth1/Stats 
RxMacCrcErr: 7688
RxMacCrcOk: 11399

I think that these errors are probably just related to the quality of the 
radio link, and do not reflect something bad, that would occur in the 
driver itself.

Best wishes,
-- 
fabrice