Messages in this thread | | | From | Jon Masters <> | Date | Sun, 23 Jan 2022 21:05:24 -0500 | Subject | Re: Selecting MMU page size for an architecture |
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Hey Sergey,
On Thu, Dec 23, 2021 at 8:15 AM Sergey Organov <sorganov@gmail.com> wrote:
> We are building custom CPU and have an option to choose either 4K or 16K > MMU minimum page size that will then be fixed in the hardware. For > reasons unrelated to the Linux kernel we'd prefer 16K, but I have some > doubts. > > What pros and cons for kernel and user-space operation 16K pages will > have over more usual 4K pages? Anything we should worry about?
If you want maximum compatibility with existing source written for industry at large (e.g. x86/Arm) and even the assumptions in other devices (and their firmware) you might connect (PCI, or even on-SoC) then you'll want to go with 4K. However, if I were designing a brand new architecture today and didn't care about legacy, I would definitely consider following Apple into 16K.
Jon.
-- Computer Architect
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