Re: advice for clock settings

Thank you for this.

On Sat 29 Dec 03:17, Volker Ruppert wrote:
> Hi!
> 
> > What are the bochs clock settings that will most closely
> > match this?  I am not really concerned by the actual time
> > taken to run the experiments, that is, I don't care if
> > a second inside the bochs machine takes 3 seconds to elapse
> > on the `host'.  What I do want is a metric that allows me
> > to compare different runs using the times reported inside
> > the machine.  (As I understand it, clock set to none will
> > have time inside the machine run at a rate that depends
> > on the number of instructions executed, which I don't think
> > does quite what I want.)
> 
> The internal Bochs timing is always based on the specified number of 
> instructions per emulated second configured with the "cpu: ips=" 
> directive. The "clock: sync=" directive is only used to have some kind 
> of synchronization between host and guest timing. If this parameter is 
> set to "none", the emulator runs at maximum speed from the host's point 
> of view and the timer intervals are stable from the guest OS's point of 
> view.

So is the internal beat the IPS, so that the bochs machine
will try to emulate that number of instructions per second?
But on a physical CPU, don't different types of instructions
take different numbers of cycles?  And isn't possible that
the same instruction may take a different number of cycles
depending on, say, where the operands are located?

Thanks,

Ariel Burton


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