RW wrote:

The FreeBSD response was to make the kernel more SMP friendly with
finer-grained locking, and to bring-in the ULE scheduler. Dragonfly BSD
was a fork off 4.x by people who thought a more radical kernel rewrite
was needed. Their kernel avoids a lot of the locking problems by using
message queues.

Just to clarify, that was the theory and intention behind Dragonfly, but in practise they have yet to achieve it after 4 years and any benefits of their ideas remain unproven. Basically they have achieved no performance gains on SMP and have effectively abandoned working on it.

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