On Tue, Mar 01, 2016 at 02:36:04PM -0800, James Bottomley wrote: > On Tue, 2016-03-01 at 16:44 -0500, Matthew Wilcox wrote: > > I think it's both. I heard from one customer who calculated that > > with a 6TB server, mapping every page into a process would take ~24MB > > of page tables. Multiply that by the 50,000 processes they expect to > > run on a server of that size consumes 1.2TB of DRAM. Using 1GB pages > > reduces that by a factor of 512, down to 2GB. > > This sounds a bit implausible: Well, that's the customer workload. They have terabytes of data, and they want to map all of it into all 50k processes. I know it's not how I use my machine, but that's customers for you ... -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>