[TUHS] UNIX on S/370

Larry McVoy lm at mcvoy.com
Tue Nov 21 05:10:55 AEST 2017


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.


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