Date: Thu, 1 Oct 2020 09:39:41 +0200 From: =?UTF-8?Q?Michal_Van=c4=8do?= <michal@microwave.sk> To: freebsd-net@freebsd.org Subject: mlx5 irq Message-ID: <0aa09fcc-dfcc-005e-8834-2a758ba6a03f@microwave.sk>
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Hi I have a server with one Mellanox ConnectX-4 adapter and the following CPU configuration (SMT disabled): # dmesg | grep SMP FreeBSD/SMP: Multiprocessor System Detected: 16 CPUs FreeBSD/SMP: 2 package(s) x 8 core(s) x 2 hardware threads FreeBSD/SMP Online: 2 package(s) x 8 core(s) What I don't understand is the number of IRQs allocated for each mlx5_core: # vmstat -i | grep mlx5_core irq320: mlx5_core0 1 0 irq321: mlx5_core0 18646775 84 irq322: mlx5_core0 21 0 irq323: mlx5_core0 97793 0 irq324: mlx5_core0 84685 0 irq325: mlx5_core0 89288 0 irq326: mlx5_core0 93564 0 irq327: mlx5_core0 86892 0 irq328: mlx5_core0 99141 0 irq329: mlx5_core0 86695 0 irq330: mlx5_core0 104023 0 irq331: mlx5_core0 85238 0 irq332: mlx5_core0 88387 0 irq333: mlx5_core0 93310221 420 irq334: mlx5_core0 1135906 5 irq335: mlx5_core0 85394 0 irq336: mlx5_core0 88361 0 irq337: mlx5_core0 88826 0 irq338: mlx5_core0 17909515 81 irq339: mlx5_core1 1 0 irq340: mlx5_core1 18646948 84 irq341: mlx5_core1 25 0 irq342: mlx5_core1 208684 1 irq343: mlx5_core1 91567 0 irq344: mlx5_core1 88340 0 irq345: mlx5_core1 92597 0 irq346: mlx5_core1 85108 0 irq347: mlx5_core1 98858 0 irq348: mlx5_core1 88103 0 irq349: mlx5_core1 104906 0 irq350: mlx5_core1 84947 0 irq351: mlx5_core1 99767 0 irq352: mlx5_core1 9482571 43 irq353: mlx5_core1 1724267 8 irq354: mlx5_core1 96698 0 irq355: mlx5_core1 473324 2 irq356: mlx5_core1 86760 0 irq357: mlx5_core1 11590861 52 I expected number of IRQs to be equal number of CPUS. According to Mellanox docs, I should be able to pin each interrupt to specific core to loadbalance. How can I do this in this case when number of IRQs is larger than number of cores? Is there any way to lower the number of interrupts? regards Michalhome | help
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