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@FreeBSD.org
Reporter: bhargava.marre...@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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