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Re: why pae kernel has only 3G memory

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On 15/10/2021 10:21, lou wrote:

> you are right, i've just tried bullseye, result is same
>
> in memtest86+, 2x2G memory are detected though 3G are tested
>
> my PC is 32bit, it can use only kernel for i386

> address sizes	: 32 bits physical, 32 bits virtual
> power management:

Correct me if I am wrong, but how I understand it is this:

Your computer can address 32 bits of memory,
2^32 bits = 4096MB, that's all you can install. PAE will not help.
Doesn't matter if CPU can run 64bit, your memory support is only up to
32bit. Some old computers have 36 or more bits for memory, that allows
them to utilize PAE in 32bit system.

Also, some of your memory is reserved by BIOS for internal use, and as
GPU extra memory. That's why any OS installed or run on this machine
only sees 2.9GB out of 4GB. 1129MB allocated and taken by BIOS.

On my modern PC I write from, I have 64bit CPU, 64bit system and 48bit
memory address space. I have 64GB installed (65536MB).
Only 64292MB visible in Debian. 1244MB taken by UEFI, which is very
similar to your result.

--
With kindest regards, Piotr.

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why pae kernel has only 3G memory lou <loushanguan2015@sina.com> - 2021-10-15 10:30 +0200
  Re: why pae kernel has only 3G memory Andy Smith <andy@strugglers.net> - 2021-10-15 11:00 +0200
    Re: why pae kernel has only 3G memory lou <loushanguan2015@sina.com> - 2021-10-15 11:30 +0200
      Re: why pae kernel has only 3G memory piorunz <piorunz@gmx.com> - 2021-10-15 12:00 +0200
    Re: why pae kernel has only 3G memory Teemu Likonen <tlikonen@iki.fi> - 2021-10-15 11:50 +0200
      Re: why pae kernel has only 3G memory lou <loushanguan2015@sina.com> - 2021-10-15 13:50 +0200
        Re: why pae kernel has only 3G memory David Wright <deblis@lionunicorn.co.uk> - 2021-10-15 17:10 +0200
          Re: why pae kernel has only 3G memory "Andrew M.A. Cater" <amacater@einval.com> - 2021-10-16 15:10 +0200
            Re: why pae kernel has only 3G memory Stefan Monnier <monnier@iro.umontreal.ca> - 2021-10-16 16:40 +0200
              Re: why pae kernel has only 3G memory lou <loushanguan2015@sina.com> - 2021-10-17 01:00 +0200
                Re: why pae kernel has only 3G memory deloptes <emanoil.kotsev@deloptes.org> - 2021-10-17 11:00 +0200

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