"It is really, really hard," he said.
Earlier this month, Waymo completed the first phase of testing in Nashville, Tennessee. Nashville will now see driverless taxis on its streets. Waymo testing is also underway in London, Washington DC, and Denver.，这一点在谷歌浏览器【最新下载地址】中也有详细论述
How often does the "slow path" actually trigger? With 32 TLB entries covering 128 KB, Intel claimed a 98% hit rate for typical workloads of the era. That sounds impressive, but a 2% miss rate means a page walk every 50 memory accesses -- still quite frequent. So the 386 overlaps page walks with normal instruction execution wherever possible. A dedicated hardware state machine performs each walk:，详情可参考heLLoword翻译官方下载
Segmentation maps a logical address (a 16-bit selector plus a 32-bit offset) to a 32-bit linear address, enforcing privilege and limit checks along the way. Paging then translates that linear address to a physical address, adding a second layer of User/Supervisor and Read/Write protection. The two layers are independent: segmentation is always active in protected mode, while paging is optional (controlled by CR0.PG).