Re: [PATCH -mm v4 6/9] atmel_serial: Split the interrupt handler

[Remy Bohmer]

Hello Haavard,

> It seems to be very sensitive to network traffic though...could it have
> something to do with softirq scheduling? Could you try the patch below
> and see if you can trigger the error message?

Funny that you mention this.
The largest latencies I currently have on RT (and rm9200) occur when
using a telnet session or NFS filesystems, thus while using network.
The impact on hardware Interrupt latencies are limited (<85us), so the
interrupt handler should still be able to keep up the receive buffer,
but context switches between threads can stall for a longer time under
some conditions.
A long shot, but can it be that the ringbuffer overflows, and that
therefor characters are lost?


Kind Regards,

Remy
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/