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

[bugzilla-daemon@bugzilla.kernel.org]

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

--- Comment #5 from Roland Kletzing (devzero@web.de) ---
apparently, things got even worse with proxmox 7, as it seems it's using async
io (via io_uring) by default for all virtual disk IO, i.e. the workaround
"cache=writeback" does not work for me anymore.

if i set aio=threads by directly editing VM configuration, things run smoothly
again.

so, still being curious:

why do VMs get severe hiccup with async (via io_submit or io_uring) when
storage is getting some load and why does that NOT happen with the described
workaround ?

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