On Sat, Nov 04, 2000 at 02:31:19AM -0600, W Bauske wrote:
> Maurice Hilarius wrote:
> >
....
>
> Nope. Just surprised me when I saw them that way.
> Makes sense they could be split across the two processors
A number of PCI busses and a number of processors are two independent
variables. It is true that higher end machines are more likely have
more PCI busses but also every CardBus laptop will have a bridge and
what amounts to the second PCI bus. I do not recall hearing about dual
processor laptops yet. Or I am just not paying enough attention?
There is quite a few more machines around with a single processor
and more that one PCI bus. The above was just an example.
>
> The lack of interrupts on the second cpu
> of the UP2K I find a bit worrisome. Implies that the
> interrupts aren't split so one processor is more loaded if you
> do heavy I/O or network accesses.
You are right to worry about that and this is a deficiency in a 2.2
kernel. 2.4 will have that fixed and there should be around patches for
2.2 to do that as well. It is not critical in that sense that if your
second CPU has some work to do it should be busy anyway but it may be
important. Keep in mind that spreading interrupt servicing is not
without costs (you have to worry more about TLBs, and poisoning caches,
and synchronization, ... ).
Michal
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