From mboxrd@z Thu Jan 1 00:00:00 1970 From: lm@mcvoy.com (Larry McVoy) Date: Mon, 20 Nov 2017 11:10:55 -0800 Subject: [TUHS] UNIX on S/370 In-Reply-To: References: <20171120160504.3C46B18C091@mercury.lcs.mit.edu> Message-ID: <20171120191055.GF9146@mcvoy.com> 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.