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Kristian Van Der Vliet has implemented asynchronous input/output. This has been tested with QEmu, which shows increased performance both due to this and the also new implementation of memory-mapped files. A development build with async I/O is already available.
Linux kernel does more-or-less all the same stuff already that the Syllable-kernel does as far as I can see, and probably those things that it doesn't do could be implemented in modules.. Atleast one benefit would be the huge amount of drivers that Linux kernel ships with. Just trim the kernel and leave out those features that aren't used in Syllable?