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RE: [Xen-ia64-devel] vIOSAPIC and IRQs delivery


  • To: <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Luck, Tony" <tony.luck@xxxxxxxxx>
  • Date: Wed, 8 Mar 2006 16:31:31 -0800
  • Delivery-date: Thu, 09 Mar 2006 00:32:11 +0000
  • List-id: Discussion of the ia64 port of Xen <xen-ia64-devel.lists.xensource.com>
  • Thread-index: AcZB/MFoD2jLWaMxSPaL3IYvvfH5VgBE2wNQ
  • Thread-topic: [Xen-ia64-devel] vIOSAPIC and IRQs delivery

>BTW, I think it will be *very* hard to find an ia64 platform which can share 
>an IRQ line.  Maybe I am wrong but I don't know such a platform :-(

Hard? No.

Expensive? Yes.

There are only 255 irqs - minus some that the base kernel steals
for cmc, mca, timer, perfmon, etc.  So any large system with a
few hundred i/o cards _must_ share irqs.  There aren't enough
for one each.

-Tony

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