> > Related question: I'm using the towertech CAN cape (mcp2515) and seeing a > lot of CPU usage by the spi process. For example, just connecting one > interface to an active bus gives 30-50% CPU usage, and that doesn't include > actually doing anything with the data! I'm running debian with kernel > 3.8.13-bone70 and using the driver source they provide (mcp2515). Is this a > known issue? Has it been addressed in more recent kernels? Thanks! >
Sounds like there is no DMA "happening" with those SPI transactions. But if DMA is a problem, using a PRU to bitbang SPI should probably offload that CPU. On Wed, Jul 20, 2016 at 2:15 AM, <[email protected]> wrote: > Could you please provide us with your working device tree overlay? > > onsdag 17. februar 2016 15.39.41 UTC+1 skrev [email protected] følgende: >> >> Related question: I'm using the towertech CAN cape (mcp2515) and seeing a >> lot of CPU usage by the spi process. For example, just connecting one >> interface to an active bus gives 30-50% CPU usage, and that doesn't include >> actually doing anything with the data! I'm running debian with kernel >> 3.8.13-bone70 and using the driver source they provide (mcp2515). Is this a >> known issue? Has it been addressed in more recent kernels? Thanks! >> > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/40daf875-4032-4506-bebb-450212f58f01%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/40daf875-4032-4506-bebb-450212f58f01%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORpL_Z5wqB0j0UyJTOaXGXWU4%3DNYmGYhqwE5K4tTtgqGVg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
