[j-nsp] 32-Bit JunOS on the 64-Bit Routing Engines

[Jonas Frey (Probe Networks)]

Well, i do have Atoms running here with 32bit and PAE and 8 GB of ram.
Even the rather slow N270 does support this. The Intel board D525MW
(which includes a soldered D525 Atom) officially (intel website)
supports only 4GB but will run fine with 8 GB.

Of course there might be older Atoms that do not support either PAE
and/or x64. But newer Gen's pretty much do.

Not sure if a Atom is useful in a router anyway...its not that powerfull
as a normal Core i3/i5. With Juniper now using 55xx Xeon's in the
multi-core RE's i guess they decided to beef up the power on them
because of growing IPv6 route tables as well as large (multiple)
VRF/IPv4 tables.


Am Donnerstag, den 25.08.2011, 19:13 -0700 schrieb Joel jaeggli:
> On 8/25/11 17:56 , Jonas Frey (Probe Networks) wrote:
> > Thats not completely accurate, for example the Intel Atom D525 does run
> > 64bit code.
> 
> there are a number of atoms the support 64bit, I think that the
> observation I was making was that there are atoms that don't support
> PAE, by virtue of not supporting 4 or more GB of ram.
> 
> >
> >> There are plenty of machines that do. virtually every intel system since
> >> the pentium pro  (except the atom) has the hardware if not the bios
> >> support for doing so, that's not germain to the question of whether it's
> >> feasible/useful in an embedded system. In particular, in a system (like
> >> for example a firewall) where kernel datastructures may represent the
> >> overwhelming source of memory utilization, the  PAE performance hit may
> >> trivially overwhelm the value of any memory that can otherwise be freed
> >> up for userspace.
> >>
> >> 64bitness has been the prefered approach for intel based servers since
> >> about 2003, but the embedded lifecycle runs on it's own timeline.
> 
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