Date: Sun, 27 Apr 1997 23:49:50 -0400 (EDT) From: Ben Black <black@zen.cypher.net> To: Chuck Robey <chuckr@mat.net> Cc: FreeBSD-SMP@FreeBSD.org Subject: Re: SMP Message-ID: <Pine.LNX.3.91.970427234820.32065N-100000@zen.cypher.net> In-Reply-To: <Pine.BSF.3.91.970427230130.22821G-100000@Journey2.mat.net>
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On Sun, 27 Apr 1997, Chuck Robey wrote: > On Sun, 27 Apr 1997, Ben Black wrote: > > > freebsd-smp is not the best example of how to do SMP. it uses the > > simplest method: one giant kernel lock. i don't know that it is > > particularly representative of advanced SMP operating systems (though > > linux also uses a giant kernel lock). > > One per CPU? One lock total? How many copies of the kernel are running one lock. one kernel. > at once? How is caching handled, per cpu, or globally (forcing the two > cpu's to look like one?) When a system call executes, what handles it, > one cpu? caching is handled in hardware with software awareness. system calls are handled by whichever CPU gets scheduled for it.. hence, symmetric. b3n
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