On Fri, Nov 15, 2002 at 10:36:18AM -0600, mark tinguely wrote: > since the allocated space is larger that a physical page (65536 > 4096), > bus_dmamem_alloc() allocates physical contiguous memory. After repeated > allocations and frees, the physical memory pages will fragment and the > allocation will fail. > > You may need to rethink your allocation strategy, such as > hold some memory allocations static between unloads and loads > if your device can take non-physical contiguous memory chunks, > use another allocation technique > or other imaginative tricks.
For the final driver, this shouldn't be a big deal. But during my current development while I'm loading/unloading the driver repeatedly, it's a minor pain. Mostly I wanted to see if I was using the bus_*() incorrectly. When the driver frees the memory with bus_dmamem_free(), can other drivers or the kernel not use this memory? -- Chuck Tuffli <chuck_tuffli AT NO_SPAM agilent DOT com> Agilent Technologies, Storage and Networking To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
