[Bug 199727] CPU freezes in KVM guests during high IO load on host

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=199727

Binarus (info@binarus.de) changed:

           What    |Removed                     |Added
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                 CC|                            |info@binarus.de

--- Comment #25 from Binarus (info@binarus.de) ---
I am by far not at a level that would allow me to really contribute something
useful to this discussion. However, we also suffer from this situation since
several years, and I hope I may ask a few questions:

First, as far as I have understood, the bug is in QEMU / KVM. Has it been fixed
in the meantime? If yes, which QEMU and which Kernel / KVM version do we need
to use to enjoy the fix?

Second, we are normally using device virtio-blk-pci. But in the comments above,
everybody uses device virtio-scsi-pci. If we already have cache=none,
aio=threads and define and use iothread objects, do we still need to switch
from virtio-blk-pci to virtio-scsi-pci to circumvent the problem?

Thanks a lot in advance!

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