On 03/30/2018 05:17 AM, Ingo Molnar wrote: > BTW., the expectation on !PCID Intel hardware would be for global pages to help > even more than the 0.6% and 1.7% you measured on PCID hardware: PCID already > _reduces_ the cost of TLB flushes - so if there's not even PCID then global pages > should help even more. > > In theory at least. Would still be nice to measure it. I did the lseek test on a modern, non-PCID system: No Global pages (baseline): 6077741 lseeks/sec 94 Global pages (this set): 8433111 lseeks/sec +2355370 lseeks/sec (+38.8%)
