Date: Wed, 27 Sep 2017 19:23:01 +0530 From: Bhargava Chenna Marreddy <bhargava.marreddy@broadcom.com> To: freebsd-net@freebsd.org Subject: FreeBSD 12.0: IRQ pinning is not working as expected with cpuset Message-ID: <56aaecf133c6b3e8ea0e4bd10f6241ca@mail.gmail.com>
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Hi, 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=E2=80=99m 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 =E2=80=98top =E2=80=93P=E2=80=99, cpu 2 is 100% free and different c= pu is ~100% busy. Thanks, Chenna.
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