Re: command ip -details -statistics link show wlan0

[Wolfgang Grandegger <wg@grandegger.com>]

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Hi Ernast,

Please do not drop the CC to the Linux-CAN mailing list...

On 06/07/2013 09:52 PM, Wolfgang Grandegger wrote:
> On 06/07/2013 09:32 PM, Ernast Sevo wrote:
>> Hello,
>>
>>  I apologize for resurrecting an old thread but I finally got around
>> to testing a program which uses
>> socket can that I wrote and I get quite a few overrun errors. I also
>> tried increasing the priority of
>> the  MCP2515 IRQ which made things slightly better for me but not good
>> enough. Are there any other
>> suggestions as to how to fix these overrun errors? or at least improve
>> them a bit more.
> 
> What priority did you use? Could you show the output of
> 
>   # ps -m -eo pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,wchan:14,comm
> 
> when the test app is running? Note that these option are not available
> with the busybox version of ps.
> 
> I also wrote:
> 
>>> Recently I also stumbled over the following optimized driver 
>>> MCP2515:
>>>
>>>   http://clientes.netvisao.pt/anbadeol/mcp2515.html
>>>
>>> But that would required some effort to update and test it.
> 
> Would be interesting if this driver behaves better concerning message
> losses. What kernel version are you using?

Just to give this driver a try, I have attached
"mcp2515-extern-v1.tar.bz2", my out-of-tree version of the MCP2515
driver mentioned above. On my Ubuntu system (running Linux 3.2.0), I
just use the following commands to get the kernel module built:

  $ tar xf mcp2515-extern-v1.tar.bz2
  $ cd mcp2515-extern
  $ ./make-modules.sh

For your embedded environment you need to tweak "make-modules.sh",
though, or use the following command:

  $ CONFIG_CAN_DEBUG_DEVICES=y CONFIG_CAN_MCP2515=m \
    make -C <path-to-your-kernel-tree> SUBDIRS=`pwd` modules

You should then be able to load "mcp2515.ko" on your embedded system
(after removing the old MCP2510 driver):

  # rmmod mcp2510
  # insmod mcp2515.ko

If you are lucky, it will work out of the box.

Wolfgang.


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