From: linux@horizon.com
Date: Thu, 21 Dec 2006 08:41:42 GMT
Subject: Re: cloning the kernel - why long time in "Resolving 313037 deltas"
Message-ID: <20061221084142.14347.qmail@science.horizon.com>

Remember, OS X is FreeBSD somehow layered on top of Mach 3.
In particular, it calls though to Mach for virtual memory.

And Mach is at its heart an academic design aiming for flexibility in
its VM system rather tha performance.  In particular, its provisions
for user-space pagers.

I can easily believe that its mmap is 10x slower that Linux.  60x is.. a
bit extreme.  A Darwin kernel hacker should probably get a nudge about it.