----- Original Message ----- From: "Jun Sun" <jsun@mvista.com> > On Thu, Jun 05, 2003 at 01:15:47AM +0200, Ralf Baechle wrote: > > On Wed, Jun 04, 2003 at 03:39:30PM -0700, Jun Sun wrote: > > > > > 1) clocks on different CPUs don't have the same frequency > > > 2) clocks on different CPUs drift to each other > > > 2) some fancy power saving feature such as frequency scaling > > > > > > But I think for a foreseeable future most MIPS SMP machines > > > don't have the above issues (true?). And it is probably worthwile > > > to synchronize count registers for them. > > > > 1) and 2) affect most SGI systems. > > > > Assuming SGI systems represent the past of MIPS, we are still ok > future-wise. :) I personally think it would be foolish to assume that future MIPS MP systems will not be subject to one or more such constraint. Kevin K.