Re: can4linux compilation for i.mx25 under 2.6.39

[Marc Kleine-Budde <mkl@pengutronix.de>]

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On 05/30/2012 02:29 PM, Martin Kozusky wrote:
>> Have you debugged which component is dropping frames? Is it the hardware
>> or the socket because your application is to slow?
> 
> I tried to solve this 19.4.2012 (thread "CAN messages being lost on
> i.MX25 with flexcan") and when I changed rcvbuf_size to 10000000 it

Oh, I see, this conversation slipped my mind.

> helped, but still sometimes few CAN frames are dropped (and many more
> when I try to write to SD card or internal flash). So I think it's not
> HW problem.
> The best for me would be some kernel module which would just put the CAN
> frame into some big "from userspace available" buffer in the interrupt
> and nothing more. My app would check if there is anything new and read
> it out.
> There are around 1500/sec (at 250kbit) can frames on the bus when the
> problem arise, I think it's not that much.

Are you writing the can frames to storage in the same thread as
receiving them?

Marc

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