[TUHS] UNIX on S/370

[Larry McVoy]

On Mon, Nov 20, 2017 at 11:36:51AM -0800, Larry McVoy wrote:
> On Mon, Nov 20, 2017 at 12:36:05PM -0700, Warner Losh wrote:
> > On Mon, Nov 20, 2017 at 12:10 PM, Larry McVoy <lm at mcvoy.com> wrote:
> > 
> > > On Mon, Nov 20, 2017 at 02:07:27PM -0500, Paul Winalski wrote:
> > > > It would mean that you wouldn't have to implement machine check
> > > > support and other hardware error handling.  The VM hypervisor would do
> > > > that for you.  It would also let you run multiple versions of UNIX
> > > > simultaneously.  Very convenient if you're doing kernel or driver
> > > > development.
> > >
> > > Indeed.  I'm currently trying to convince Netflix that the way to get the
> > > most performance out of a NUMA machine is to boot a different kernel on
> > > each NUMA domain.  One way we might demo that is on a 4 domain system
> > > lock down 3 hypervisors and their guest OS to 3/4 of the NUMA domains
> > > and give the host kernel the 4th.
> > 
> > Having a single nic presents a bit of a challenge for this... I look
> > forward to this demo...
> 
> Nope, do disks/mics/mem per domain.  So no bonding.

Sorry s/mics/nics/
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Larry McVoy            	     lm at mcvoy.com             http://www.mcvoy.com/lm