[Bug 222789] IRQ pinning is not working as expected with cpuset -x

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222789

            Bug ID: 222789
           Summary: IRQ pinning is not working as expected with cpuset -x
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: bhargava.marreddy at broadcom.com

Can some please guide me in configuring IRQ pinning for Network driver?

Looks like IRQ pinning is not working as expected with cpuset command.

This is what I’m doing ..

1. Identify the IRQ number on rxq0
# vmstat -i | grep rxq0
irq271: bnxt0:rxq0 2 0

2. Read the current affinity mask:
#cpuset -g -x 271
irq 271 mask: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
19, 20, 21, 22, 23

3. Set CPU2 for IRQ 271
# cpuset -l 2 -x 271

4. Make sure by reading back ..
# cpuset -g -x 271
irq 271 mask: 2

5. Start TCP traffic, interrupts will be coming into IRQ 271 (rxq0) but
different CPU will be processing then (but not CPU 2).
As per ‘top –P’, cpu 2 is 100% free and different cpu is ~100% busy.

Thanks,
Chenna.

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