> If it is feasible in future that hardware vendors can make patrol > scrubber programmable, we can even direct the scanning to patrol > scrubber. There was an attempt to create an ACPI interface for this. I don't know if it made it into the standard. I didn't do anything with it for Linux because the interface was quite complex. >From a h/w perspective it might always be complex. Consecutive system physical addresses are generally interleaved across multiple memory controllers, channels, DIMMs and ranks. While patrol scrubbing may be done by each memory controller at the channel level. So a simple request to scan a few megabytes of system physical address would require address translation to figure out the channel addresses on each of the memory controllers and programming each to scan the pieces they contribute to the target range. -Tony
