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IronPort developed a high performance file system and an I/O driven scheduler optimized for the asynchronous nature of messaging (hence "Async"OS).
If you wanted to do the same but make it open source, what exactly would need to change?
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This is probably mostly marketing - FreeBSD already handles "asynchronous nature of messaging" rather well. They most likely short-circuited some processing in the network stack for their specific purposes, same for the file system.