[parisc-linux] 715 useful

[Philipp Rumpf]

> For the machines which have ASP, am I right in saying they have no other
> sources of interrupts?  ie what I want to do is:
> 
> if we detect an ASP, set the interrupt routine to load the IRR from ASP
> and then only make one pass through do_irq_mask instead of two.
> 
> This lets me not bother which irq line ASP is interrupting on, at the
> expense of not being able to take interrupts from any other source.
> And it'll reduce interrupt latency on those older machines with ASP,
> so it seems like a win, unless I'm wrong and it's possible to add other
> sources of interrupt to them.

Matthew,  I think you are overestimating the negative impact this code has on
interrupt latency.  Furthermore, I do not believe solving a problem that is a
limitation of the interface used - our current driver table device management
system does not allow offsetting IRQ numbers in the same way a linked list
would (and does, for PCI).

The very same problem you want to avoid has to be solved in a clean way for Lasi,
and handling it different on otherwise very similar machines (712, 715) does
more to confuse developers and users (for whom we cannot totally avoid contact
with virtual IRQ numbers) than it does to improve the actual performance of the
kernel.

If you should disagree on the order of performance loss we are talking about here,
please provide benchmarks - should the delay turn out to be unacceptable, we need
to find a way of lowering it, even if it does mean to obfuscate code.


	Philipp Rumpf

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The hppa-linux project (soon to be renamed to parisc-linux) is really
concerned with the development of the monolithic port of linux to that
hardware.  MkLinux is completely different.

- Alex

-- 
Alex deVries <puffin@redhat.com>     
Red Hat Contrib Net maintainer          
Ottawa, Canada  
HPPA/Linux Porting Team


On Wed, 3 Mar 1999, Takeshi Maruyama wrote:

> Hello,
> 
> I installed MkLinux for PA-RISC  to my HP712/60.
> The console cannot be displayed with my HP712.
> Is the console displayed in your HP712?
> 
> --
> Takeshi Maruyama. Iwata-city.
> maru@hans.or.jp
> 
> 
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