Messages in this thread | | | Date | Wed, 11 Feb 2009 21:43:14 -0500 (EST) | From | Steven Rostedt <> | Subject | Re: [PATCH 0/8] git pull request for tip/tracing/core |
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On Thu, 12 Feb 2009, Kenji Kaneshige wrote: > Luck, Tony wrote: > >>> Before we go and make the change, Peter brought up a good point on IRC. Is > >>> there any reason that ia64 needs 1 << 14 IRQs? That's 16384! > >>> > >>> Perhaps the better solution wolud be (if possible), to simply lower the > >>> number of bits. > >> i'm the wrong person to be asked about that. (Cc:-ed the right people) > > > > People build some pretty big systems on ia64. SGI's largest has 4096 > > cpus ... so 16384 IRQs is only 4 per cpu. That doesn't sound like very > > many to me. > > > > Fujitsu added the vector domain support for ia64 to get around the shortage > > of IRQs for large machines. Added them to the Cc: list to see if they have > > comments on how many IRQs are needed. > > > > The 1024 IRQs are enough for GSIs on our maximum configuration. But > if the devices are MSI/MSI-X capable, it could be more than 1024.
But you would never expect more than 1024 nested interrupts all on the same CPU? That is, to have over 1024 interrupts interrupting each other?
-- Steve
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