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

Eneko Lacunza elacunza at binovo.es
Thu May 28 14:37:02 CEST 2015


On 28/05/15 13:44, Stanislav German-Evtushenko wrote:
> Eneko,
>
> > I'm not kernel/IO expert in any way, but I think this test program has a race condition, so it is not helping us diagnose the problem.
> > We're writing to buffer x while it is in use by write syscall. This is plainly wrong on userspace.
> Yes, and this is exactly what is happening inside QEMU-KVM process and this is what I wanted to demonstrate.
Ok, but this doesn't demonstrate the problem in qemu-kvm; only that 
we're getting the same behaviour. Please note that I'm not saying there 
isn't any bug in qemu; we must find a way to prove the bug, either 
pointing to source code or with a correct test program (if you have done 
so I missed it sorry).

Cheers,
Eneko

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