Re: [Qemu-devel] [SPDK] qemu process hung at boot-up, no explicit errors or warnings

[Bob Chen]

2018-04-21 1:34 GMT+08:00 John Snow <address@hidden>:

>
>
> On 04/20/2018 07:13 AM, Bob Chen wrote:
> > 2.11.1 could work, qemu is no longer occupying 100% CPU. That's
> > interesting...
> >
>
> Does 2.12 use 100% even at the firmware menu? Maybe we're not giving
> this VM long enough to hit the spot that causes it to use 100%.
>
> > Now I can see the starting screen via vnc, says that not a bootable disk.
> >
>
> If it's stopping at the firmware I think the guest is not being taken
> into account, and the firmware is either trying to boot the wrong disk
> or your disk is corrupted. (Or it can't see your disk at all -- I'm
> personally not very familiar with using SPDK.)


> Can you share your command line with us?
>

I opened another thread to discuss this issue, looks like there's something
wrong with the spdk official doc.

However, 2.12 is still very likely to be buggy. I'm sure I waited long
enough but the CPU never dropped below 100%. The vnc screen stopped at
"Loading SeaBIOS ..."

Again, 2.10 and 2.11 are fine. Though "No bootable device" but CPU dropped
anyway.


>
> >
> > Is that because the guest OS's virtio vhost driver is not up to date
> enough?
> > ​
> >
> > Thanks,
> > Bob
> >
>
> On the QEMU-devel list and many other technical lists, can you please
> reply in-line instead of replying above? ("top posting")
>
> Thank you,
> --John
>
> > 2018-04-20 1:17 GMT+08:00 John Snow <address@hidden
> > <mailto:address@hidden>>:
> >
> >     Forwarding to qemu-block.
> >
> >     On 04/19/2018 06:13 AM, Bob Chen wrote:
> >     > Hi,
> >     >
> >     > I was trying to run qemu with spdk, referring to
> >     > http://www.spdk.io/doc/vhost.html#vhost_qemu_config
> >     <http://www.spdk.io/doc/vhost.html#vhost_qemu_config>
> >     >
> >     > Everything went well since I had already set up hugepages, vfio,
> vhost
> >     > targets, vhost-scsi device(vhost-block was also tested), etc,
> without
> >     > errors or warnings reported.
> >     >
> >     > But at the last step to run qemu, the process would somehow hang.
> And its
> >     > cpu busy remained 100%.
> >     >
> >     > I used `perf top -p` to monitor the process activity,
> >     >   18.28%  [kernel]                      [k] vmx_vcpu_run
> >     >    3.06%  [kernel]                      [k] vcpu_enter_guest
> >     >    3.05%  [kernel]                      [k]
> system_call_after_swapgs
> >     >
> >     > Do you have any ideas about what happened here?
> >     >
> >     > Test environment: latest CentOS 7 kernel, nvme ssd, spdk v18.01.x,
> >     > dpdk 17.11.1, qemu 2.12.0-rc2. Detail log is attached within this
> mail.
> >     >
> >
> >     Have you tried any other versions? (2.11.1, or 2.12-rc4?)
> >
> >     >
> >     >
> >     > Thanks,
> >     > Bob
> >     >
> >
> >
>