Messages in this thread | | | Date | Thu, 12 Feb 2009 11:39:34 +0900 | From | Kenji Kaneshige <> | Subject | Re: [PATCH 0/8] git pull request for tip/tracing/core |
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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.
Thanks, Kenji Kaneshige
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