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!
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