On Sat, Jun 08, 2019 at 10:14:04AM +0800, Baoquan He wrote: > Here, 4PB = 4*2^50 = 4*1024^5, the vmemmap should be 64 TB, am I right? PB is 1000^5 petabytes. 1024^5 is PiB or pebibytes. https://en.wikipedia.org/wiki/Petabyte -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Mary Higgins, Sri Rasiah, HRB 21284 (AG Nürnberg) --