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Date:   Mon, 19 Jul 2021 20:33:30 +0000
From:   Dexuan Cui <>
To:     Saeed Mahameed <>,
        Leon Romanovsky <>
CC:     "" <>,
        "''" <>,
        "''" <>,
        Haiyang Zhang <>,
        "''" <>
Subject: RE: [5.14-rc1] mlx5_core receives no interrupts with maxcpus=8

> From: Saeed Mahameed <>
> Sent: Monday, July 19, 2021 1:18 PM
> > > ...
> > > It turns out that adding "intremap=off" can work around the issue!
> > >
> > > The root cause is still not clear yet. I don't know why Windows is
> > > good here.
> >
> > The card is stuck in the FW, maybe Saeed knows why. I tried your
> > scenario and it worked for me.
> >
> > Thanks
> I don't think the FW is stuck since we see the cmd completion after
> timeout, this means that the 1st interrupt from the device got lost.
> "wait_func_handle_exec_timeout:1062:(pid 1416): cmd[0]:
> CREATE_EQ(0x301) recovered after timeout"
> the fact that this happens on  5.14 and 5.4 kernels and the issue is
> worked around via bringing the cpus online, or disabling intremap,
> means that there is something wrong with the interrupt remapping
> mechanism, maybe the interrupt is being delivered on an offline cpu ?
> is this a qemu/VM guest or a bare metal host ?

Thanks for the replies! 

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. 


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