netdev - RE: [5.14-rc1] mlx5_core receives no interrupts with maxcpus=8

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Date:   Wed, 21 Jul 2021 23:16:41 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Dexuan Cui <decui@...rosoft.com>,
        Saeed Mahameed <saeed@...nel.org>,
        Leon Romanovsky <leon@...nel.org>
Cc:     "linux-pci\@vger.kernel.org" <linux-pci@...r.kernel.org>,
        "'netdev\@vger.kernel.org'" <netdev@...r.kernel.org>,
        "'x86\@kernel.org'" <x86@...nel.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "'linux-kernel\@vger.kernel.org'" <linux-kernel@...r.kernel.org>
Subject: RE: [5.14-rc1] mlx5_core receives no interrupts with maxcpus=8

Dexuan,

On Mon, Jul 19 2021 at 20:33, Dexuan Cui wrote:
> This is a bare metal x86-64 host with Intel CPUs. Yes, I believe the
> issue is in the IOMMU Interrupt Remapping mechanism rather in the
> NIC driver. I just don't understand why bringing the CPUs online and
> offline can work around the issue. I'm trying to dump the IOMMU IR
> table entries to look for any error. 

can you please enable GENERIC_IRQ_DEBUGFS and provide the output of

cat /sys/kernel/debug/irq/irqs/$THENICIRQS

Thanks,

        tglx