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Warming up the page cache is in fact already done on modern systems: http://manpages.ubuntu.com/manpages/xenial/man8/ureadahead.8.html http://manpages.ubuntu.co

Warming up the page cache is in fact already done on modern systems: http://manpages.ubuntu.com/manpages/xenial/man8/ureadahead.8.html http://manpages.ubuntu.com/manpages/xenial/man8/ureadahead.8... I'd agree that making ureadahead more aggressive would indeed make more sense than just sticking your roots in RAM. It shouldn't impact your boot time very much and is much more flexible! But maybe there's some special perf benefit to the ramroot approach..

effie 7y ago
One theoretical benefit is that linux won't evict file data from a ramdisk, but it will evict it from cache and buffers if it thinks they are not needed that much. The kernel algorithms for memory management are very opaque and linux may do some suboptimal decisions, especially when applications are starving for memory.