Re: [TECH TOPIC] Reaching consensus on CONFIG_HIGHMEM phaseout

Richard Weinberger
2025-09-10T20:33:14Z

Dave,

----- Ursprüngliche Mail -----
> Von: "Dave Hansen" <dave@sr71.net>
>> Even with a new memory split, which could utilize most of the
>> available memory, I expect there to be issues with various
>> applications and FPGA device drivers.
> I'd be really curious what the _actual_ issues would be with a
> non-standard split. There are a lot of "maybe" problems and solutions
> here, but it's hard to move forward without known practical problems to
> tackle.
>
> Has anybody run into actual end user visible problems when using one of
> weirdo PAGE_OFFSET configs?

In the past I saw that programs such as the Java Runtime (JRE) ran into
address space limitations due to a 2G/2G split on embedded systems.
Reverting to a 3G/1G split fixed the problems.

Thanks,
//richard