Tom Chen wrote:
Is there a way in solaris to figure out how many CPUs the system has and which interrupt is assigned to which CPU? I am wondering why most of the receive interrupts are assigned to CPU 1 in our test sometimes. I wish I could assign different interrupts to different CPUs.
From within a driver? You can look at ncpus to tell you how many CPUs you have. As for interrupt -> CPU mapping; that can change dynamically (e.g. when a CPU is offlined) so relying on the mapping is risky. As for making sure interrupts get spread; there is a policy tweakable somewhere in the APIC code (can't remember where) and you need to make sure it's set to round-robin interrupt assignment; I'm assuming you're using MSI-X on a recent Solaris build.
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