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Date: Wed, 2 Jul 2003 11:40:02 -0400
From: Jake Burkholder <jake@k6.locore.ca>
To: Marcel Moolenaar <marcel@xcllnt.net>, sparc64@freebsd.org
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Subject: Re: OFW_NEWPCI dmesg diffs
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Apparently, On Tue, Jul 01, 2003 at 09:09:28PM -0700,
	John-Mark Gurney said words to the effect of;

> Marcel Moolenaar wrote this message on Tue, Jul 01, 2003 at 21:01 -0700:
> > BTW: vmstat -i doesn't work:
> > 
> > sparc% vmstat -i
> > interrupt                     total       rate
> > Total                             0          0
> > sparc% 
> 
> I have patches to fix this.
> 
> But, I the problem is that both soft interrupts and vector interrupts
> are useful to know.  All vector interrupts are dispatched via soft
> interrupts, so if we count both, the interrupt count is double.  We
> need soft interrupts if we want to see the clock ticking.
> 
> bash-2.05b$ vmstat -i
> interrupt                     total       rate
> stray                             1          0
> pil                               1          0
> ithrd pil2                    69163         16
> gem0 vec2012                  27748          6
> gem1 vec1990                     70          0
> atapci0 vec1996                41345          9
> tick pil14                   421278         99
> Total                        559606        132
> 
> notice that ithrd is equal to gem0 + gem1 + atapci0.  pil is the
> priority interrupt level (aka soft interrupts).
> 
> Comments?  Do we count both? or not include soft interrupts? or not
> include the ithrd pil?

I think counting both is fine for now.  Eventually what I intend to do
is change tick handling so that it looks more like a vectored interrupt.
The pil14 handler would queue and reprioritize the tick interrupts so
that tick can be re-armed independent of the handler actually running.
The soft interrupt that drives hardclock would have a vector number
(outside of the normal 11 bits for hardware interrupts), and be counted
uniformly.

Jake