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List-Id: The Unix Heritage Society mailing list Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: MIT's FOS (Factored Operating System) research OS did cross address space co= pies as part of its messaging machinery. HPC networking does this by using shared memory (Cross Memory Attach and XPM= EM) in a traditional kernel.=20 -L > On May 18, 2024, at 9:21=E2=80=AFPM, Larry McVoy wrote: >=20 > =EF=BB=BFOn Sat, May 18, 2024 at 06:04:23PM -0700, Bakul Shah via TUHS wro= te: >> [1] This brings up a separate point: in a microkernel even a simple >> thing like "foo | bar" would require a third process - a "pipe >> service", to buffer up the output of foo! You may have reduced >> the overhead of individual syscalls but you will have more of >> cross-domain calls! >=20 > Do any micro kernels do address space to address space bcopy()? > -- > --- > Larry McVoy Retired to fishing http://www.mcvoy.com/lm/= boat