> On Nov 15, 2018, at 10:21 AM, Mark Pizzolato <m...@infocomm.com> wrote: > > Hi Paul, > > On Thursday, November 15, 2018 at 6:32 AM, Paul Koning wrote: >> I just installed NetBSD/VAX V8 on SIMH. The documentation mentions "set >> cpu idle=netbsd", but it doesn't work -- I'm stuck at 100% CPU. >> >> I'm running it on the microvax3900 simulator, if that makes a difference. >> Any >> ideas? > > I thought this had gotten settled a long time ago. > > At one point, the BSD code that implemented what the OS does when there is > nothing else to do got changed from how things were done in earlier BSD > kernels. The big change seemed to align with when SMP support was added to > the kernel to support other (non VAX) architectures. This restructuring > created some platform specific routine which existed to do what was good on > that platform while idling. As it turned out, what was initially implemented > in the VAX specific code that did that was operationally indistinguishable > from other code running elsewhere in the OS, and given that on those kernel > versions idling wasn't possible under simh. Someone (I don't recall who) had > come along and complained about this and after explaining the issue, I > suggested that if the VAX specific routine were changed to do something that > wasn't done anywhere else in the OS simh idling support could once again > work. When I was poking around, I observed that nothing in any BSD kernel > used IPL 1 for anything, so I suggested that the kernel idle routine could > set IPL to 1 could be an indicator that simh could detect and properly idle. > The party who had complained passed this suggestion back as a VAX platform > specific patch and it ultimately was included in the kernel and it worked for > subsequent versions. > > Maybe this change has gotten removed from the VAX specific BSD code in recent > versions, or maybe something else is going on with your simh configuration > that is interfering with idling. > > I can't find a VAX platform NetBSD 8.0 ISO image, or I'd have checked out > what is happening before writing this. If you can make the disk image and > your configuration file available for me. I'll explore the details and let > you know what is happening.
I just followed these instructions: http://www.netbsd.org/ports/vax/emulator-howto.html using the 8.0 image found via the link on that page. paul _______________________________________________ Simh mailing list Simh@trailing-edge.com http://mailman.trailing-edge.com/mailman/listinfo/simh
