* Andi Kleen <[email protected]> wrote:
> > > The i8259 driver uses it and it is known to be needed on some old
> > > chipsets. But it doesn't really have any "own" ports to use afaik.
> >
> > we'll solve that via an i8259-specific quirk. That is a lot cleaner
> > and maintainable than the current generic, always-enabled "opt out"
> > port-0x80 quirk.
>
> You mean using pci quirks + udelay? Will be probably challenging to
> collect PCI-IDs for that. And there might be old systems needing it
> without PCI. They likely won't have DMI either.
>
> In theory you could make it a DMI year cut off of course (and assume
> old if no DMI, although that happens occasionally with new systems
> too); but that is generally considered ugly.
>
> I don't think it's a big problem to keep delays of some form by
> default in 8259 -- people who care about performance should be
> definitely using APIC mode instead.
do you remember which old systems/chipsets were affected by this
problem? We had many - meanwhile fixed - PIC related problems, maybe
it's a red herring and the delay just papered it over.
Ingo
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