SMP and setrunnable()- scheduler 4bsd

Terry Lambert tlambert2 at
Tue Jul 8 23:51:40 PDT 2003

John Baldwin wrote:
> This is why HLT is not enabled in SMP by default (or at least was,
> it may be turned on now).  Given that the clock interrupts are
> effectively broadcast to all CPU's one way or another for all
> arch's (that I know of), you will never halt more than the interval
> between clock ticks on any CPU.

I thought that there was either a SPARC or Alpha box where Poul
had to mess with the divider because they were delivered round
robin, instead?

-- Terry

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