I’m actually working on exactly the same thing right now and I’m going the ioctl() route. The general idea is for user space to allocate the buffer which will be used for the DMA transfer and an ioctl() will be used to pass the size and address of this buffer to the device driver. The … Read more
I heard (read it on the internet somewhere) that mmap() is faster than sequential IO. Is this correct? If yes then why it is faster? It can be – there are pros and cons, listed below. When you really have reason to care, always benchmark both. Quite apart from the actual IO efficiency, there are … Read more
Try using the getconf utility, which will allow you to retrieve the page size, in bytes, easily. getconf PAGESIZE Example output, in bytes: 4096