[SPDK] Re: ioat: "could not start channel" after abnormal exit

Hi Jiahao,

I don't know off the top of my head but I can try and repro with one of the SPDK tools and see what I can see.  In the meantime you can try "/scripts/setup.sh reset" followed by setup.sh again to see if that gives you a temp workaround

Thx
Paul 

On 7/14/20, 7:49 PM, "lijh2015(a)mail.ustc.edu.cn" <lijh2015(a)mail.ustc.edu.cn> wrote:

    Hi SPDK team,

    I'm using SPDK (v20-01-pre) to evaluate I/OAT performance. There are some bugs in my benchmark program, 
    but after I use ctrl+c to quit my program and restart it again, some error messages appeared:

    ioat.c: 480:ioat_channel_start: *ERROR*: could not start channel: status = 0x3
     error = 0
    ioat.c: 547:ioat_enum_cb: *ERROR*: ioat_attach() failed
    EAL: Requested device 0000:00:04.0 cannot be used
    ioat.c: 480:ioat_channel_start: *ERROR*: could not start channel: status = 0x3
     error = 0
    ioat.c: 547:ioat_enum_cb: *ERROR*: ioat_attach() failed
    EAL: Requested device 0000:00:04.1 cannot be used
    ioat.c: 480:ioat_channel_start: *ERROR*: could not start channel: status = 0x3
     error = 0
    ioat.c: 547:ioat_enum_cb: *ERROR*: ioat_attach() failed
    EAL: Requested device 0000:00:04.2 cannot be used
    ioat.c: 480:ioat_channel_start: *ERROR*: could not start channel: status = 0x3
     error = 0
    ioat.c: 547:ioat_enum_cb: *ERROR*: ioat_attach() failed
    EAL: Requested device 0000:00:04.3 cannot be used
    ioat.c: 480:ioat_channel_start: *ERROR*: could not start channel: status = 0x3
     error = 0
    ioat.c: 547:ioat_enum_cb: *ERROR*: ioat_attach() failed
    EAL: Requested device 0000:40:04.0 cannot be used
    ioat.c: 480:ioat_channel_start: *ERROR*: could not start channel: status = 0x3
     error = 0
    ioat.c: 547:ioat_enum_cb: *ERROR*: ioat_attach() failed
    EAL: Requested device 0000:40:04.1 cannot be used
    ioat.c: 480:ioat_channel_start: *ERROR*: could not start channel: status = 0x3
     error = 0

    I checked the code in lib/ioat/ioat.c, it seems is_ioat_idle always returns negative results.
    What should I do to deal with this problem without rebooting my server? Or, at least,
    how to prevent it?

    Thanks,
    Jiahao Li
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