> * Reshetova, Elena <elena.reshet...@intel.com> wrote: > > > CONFIG_PAGE_TABLE_ISOLATION=n: > > > > base: Simple syscall: 0.0510 microseconds > > get_random_bytes(4096 bytes buffer): Simple syscall: 0.0597 microseconds > > > > So, pure speed wise get_random_bytes() with 1 page per-cpu buffer wins. > > It still adds +17% overhead to the system call path, which is sad. > Why is it so expensive?
I guess I can experiment further with buffer size increase and/or using HW acceleration (I mostly played around different rdrand paths now). What would be acceptable overheard approximately (so that I know how much I need to squeeze this thing)? Best Regards, Elena.
