On 5/5/2010 7:32 PM, Jason Gunthorpe wrote: > On Wed, May 05, 2010 at 07:54:54AM -0700, Roland Dreier wrote: > >> > The current code requires num_possible_cpus() + 1 MSIX vectors. However, >> > num_possible_cpus() stands for the max number of supported CPUs by the >> kernel. >> >> I believe this is wrong -- num_possible_cpus() is the maximum number of >> CPUs for the running system, including hotplug. >> > FWIW, I've seen some systems running RH kernels that blow up here > because they run out of interrupt numbers if you have two IB cards in > them. > > Mainline kernels have a reworked IRQ number allocator and don't have a > problem, so maybe this is an ofed only patch? > This is not related to OFED We found it in performance work of our EN (10G) driver
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