does l4 linux now support smp?
Adam Lackorzynski
adam at os.inf.tu-dresden.de
Mon Mar 3 18:07:42 CET 2008
On Mon Mar 03, 2008 at 10:16:00 +0100, Yang Xu wrote:
> On 2/29/08, Adam Lackorzynski <adam at os.inf.tu-dresden.de> wrote:
> >
> >
> > On Fri Feb 29, 2008 at 15:23:01 +0100, Yang Xu wrote:
> > > does anybody know that whether l4 linux now already support smp or not
> > > please?
> >
> > It does.
>
>
> So if I download the latest version of L4-linux, I can run it on a
> multiprocessor system, and it can make good use of all the cores , right?
Not currently as the µkernel is not ready yet.
> > As far as I know, linux 2.6.x already supports smp. So I am wondering the
> > > the l4-linux 2.6 supports smp or not. if yes, it is the linux kernel
> > > distributes the threads across the cores or the ukernel does this?
> >
> > Linux distributes it's thread across it's vCPUs, and your vCPUs are
> > where you put them.
>
>
> I don't know whether I understand this correctly. it is the linux that
> distributes the threads to all the cores, not the ukernel.
>
> Does this mean that the ukernel doesn't realise the existence of the other
> cores?
It does but it won't move threads around itself. Userland (e.g. L4Linux)
is supposed to do that and it does so as usual.
Adam
--
Adam adam at os.inf.tu-dresden.de
Lackorzynski http://os.inf.tu-dresden.de/~adam/
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