[HECnet] KLH10 not idling host CPU

[Boyanich, Alastair]

Hi Mark,

I can only speak for the VAX side of things, but ymmv and possibly similar?

I’ve seen this with VMS on the VAX simulator. I think the idle loop detection changed a while back (perhaps on KLH10 also?) so it wasn’t detecting the vms idle loop correctly and thus emulating every cycle, driving the cpu to 100%.

There was an option I used to feed it in the .ini which was:

SET CPU IDLE=VMS

But this has not made much of a difference for a long while. On-topic, SET CPU IDLE=NETBSD has worked for me. I am unsure of the reasoning.

Regards,
Al Boyanich


From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Mark Abene
Sent: Sunday, 4 March 2018 7:03 PM
To: hecnet at update.uu.se
Subject: [HECnet] KLH10 not idling host CPU

I'm posting this here in the hopes that there are other KLH10 emulator users on HECnet.

I've been using KLH10 with the tap patches for years and years, and idling has always worked fine. At some point over the recent couple of years, idling stopped working for me on linux (I run ubuntu 16.04.4 LTS with latest updates as of yesterday, on a 64-bit intel machine). My CPU is stuck at 100% utilization, without even starting an emulated OS (I run TOPS-20). In fact, as soon as I type "GO" in KLH10 and before doing anything else, the CPU immediately shoots to 100%. Is anyone else seeing this? In older versions of ubuntu/linux this didn't happen.

Thanks,
Mark

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