[pve-devel] Default cache mode for VM hard drives

Dietmar Maurer dietmar at proxmox.com
Thu May 28 17:47:54 CEST 2015

> > But there is currently only one io-thread in qemu, so this
> > cannot happen with qemu if above is the only problem?
> But there are other threads, right? Buffer can be changed by another
> thread where guest OS itself is running.

No, AFAIK there is only one thread doing all IO (currently). But it
is using async IO with coroutines - maybe that can also trigger the

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