[SPDK] Re: performing i/o to a disk while removing cause the cpu to stuck

[SPDK] Re: performing i/o to a disk while removing cause the cpu to stuck

[Andrey Kuzmin]

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On Mon, Feb 17, 2020, 15:49 Avner Taieb <avner(a)reduxio.com> wrote:

> Hi,
> We are using SPDK 19.07, nvme device, vfio driver.
> We got into a situation that removing disk, while performing I/O to it,
> stall the CPU in the function spdk_mmio_write_4, when accessing the PCI
> register, in the line  *addr = val
>
> any idea ?
>

I'd start by checking the associated slot capabilities register for
hot-plug support with 'lspci -vvv'.


Regards,
Andrey


> Thanks,
> Avner
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[SPDK] Re: performing i/o to a disk while removing cause the cpu to stuck

[Liu, Changpeng]

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Hi Avner,

Do you mean only NVMe driver is used for your cases ?

By default, we enabled the hotplug support with bdev/nvme module layer, there need a poller to process the removal uevents from vfio-pci driver.


> -----Original Message-----
> From: Avner Taieb <avner(a)reduxio.com>
> Sent: Monday, February 17, 2020 8:50 PM
> To: Storage Performance Development Kit <spdk(a)lists.01.org>
> Subject: [SPDK] performing i/o to a disk while removing cause the cpu to stuck
> 
> Hi,
> We are using SPDK 19.07, nvme device, vfio driver.
> We got into a situation that removing disk, while performing I/O to it,
> stall the CPU in the function spdk_mmio_write_4, when accessing the PCI
> register, in the line  *addr = val
> 
> any idea ?
> 
> Thanks,
> Avner
> _______________________________________________
> SPDK mailing list -- spdk(a)lists.01.org
> To unsubscribe send an email to spdk-leave(a)lists.01.org