[vfio-users] Guest random short Hang-ups

[Jiri 'Ghormoon' Novak]

Hi,

yes, also with SSD it is possible to hang it in my case, though it needs
quite a lot of workload to happen. also in my case it gets a bit worse
than on ext4 becuase of the CoW nature of ZFS, but it seems the root
cause is overloaded IO.

IT would be nice to make the guest wait, not to pause the VM, that would
make more sense in this case. though it's true it might not be
implemented ...

Gh.

Andrei Grigore wrote:
>
> This was also my thought. It seems like upon some level of IO activity
> it hangs for a bit. I am using a SSD already.
>
> I am not sure you can do that.
>
>
> On Oct 13, 2016 11:17, "Ghormoon" <ghormoon at gmail.com
> <mailto:ghormoon at gmail.com>> wrote:
>
>     Hi,
>
>     Shuttering/hangs usually happen to me if IO doesnt manage to cope
>     with the load.
>     When using zfs (zvol) this basically means that I can use this
>     only on ssd drives.
>     Can this be the same case? Any ideas how to make the guest wait
>     for io, not qemu?
>
>     Regards,
>     Gh.
>
>
>     On Oct 13, 2016 11:09, "Andrei Grigore" <andrei.grg at gmail.com
>     <mailto:andrei.grg at gmail.com>> wrote:
>
>         Hi all,
>
>         What can cause random guest Hang-ups? I mean totally very
>         short freezes. It can't be the input pheriphrals, since I am
>         using Synergy. Can it be CPU related?
>
>         I have a FX-8230 with 8 cores and I am using only 6 Cores for
>         the Guest with the following pinning:
>
>         Core 1 - 2-3
>         Core 2 - 4-5
>         Core 3 - 6-7
>
>         Tried with both .raw and .qcow2 on ext4 Storage.
>
>         Thanks,
>         Andrei.
>
>
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