Friday, October 11, 2024

Re: Memory upgrade

On 2024-10-09, obsdml@loopw.com <obsdml@loopw.com> wrote:
>> In a second server I have upgraded from 7.5 i386 to 7.6 i386 but server sees only 4GB of RAM
>
>> Is anybody with similar experiences? Any ideas how to fix RAM?
>
> run 64bit OpenBSD
>
> 32bit address space is limited to a max of 4GB**, and some of that is eaten up by PCI devices, etc.
> ** PAE can work around this, but I'm not sure if OpenBSD supports PAE at all (and theres other issues/caveats with using PAE of course, including speed and security)

OpenBSD does support PAE on i386, but not for increasing address space,
just for W^X. See /sys/arch/i386/i386/pmapae.c r1.28.


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