Linus Torvalds (torvalds.delete@this.linux-foundation.org) on March 17, 2021 11:59 am wrote:
> dmcq (dmcq.delete@this.fano.co.uk) on March 17, 2021 11:15 am wrote:
> >
> > So the question becomes - can the performance of IPC be dramatically improved?
>
> The answer is simple: "no".
>
> It's just fundamentally more expensive to send some kind of message than
> it is to just share the data structures and use the cache coherency.
>
> The only way "IPC" is competitive is if you define IPC as
> "memory mapping your data structures in shared memory".
>
> We call that "monolithic kernel" exactly because it shares that data address space.
>
> In other words, your whole argument hinges on unreality. In a world that doesn't exist,
> and no reasonable person expects to exist or even has a realistic plan for, in any kind
> of reasonable timeframe, your argument simply makes absolutely zero sense at all.
>
> Please make a distinction between reality and your dream world, and just admit it,
> and stop making arguments that make no sense in other peoples realities, ok?
>
> The name of the forum is "real world tech". Not "my private fantasy tech".
>
> Linus

There is quite an obvious solution to most of the problems you are describing when criticizing µkernels, but you do not see it.

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