Hello everybody,
I'm a bit confused regarding windows guests and PIO.. some time ago, I was
trying
to find out, why one of my windows guests was running terribly slow.
After checking the trace-cmd output, Avi stated that windows were using PIO
instead
of DMA, after changing that, windows indeed
On 02/02/2012 11:16 PM, Nikola Ciprich wrote:
> Hello everybody,
>
> I'm a bit confused regarding windows guests and PIO.. some time ago, I was
> trying
> to find out, why one of my windows guests was running terribly slow.
> After checking the trace-cmd output, Avi stated that windows were using
> Not all PIO operations are DMA. Provide a trace and we can look.
Hi,
here's snippet:
qemu-kvm-16441 [000] 12887154.698329: kvm_pio: pio_read at
0xc002 size 1 count 1
qemu-kvm-16441 [000] 12887154.698331: kvm_userspace_exit: reason
KVM_EXIT_IO (2)
qemu-k
On 02/05/2012 11:01 PM, Nikola Ciprich wrote:
> > Not all PIO operations are DMA. Provide a trace and we can look.
>
> Hi,
> here's snippet:
>
> qemu-kvm-16441 [000] 12887154.698329: kvm_pio: pio_read
> at 0xc002 size 1 count 1
> qemu-kvm-16441 [000] 12887154.698331:
> That's virtio, not IDE.
well, this seems a bit strange to me, the only virtio device I can
see is balloon dev, can this be it?
how can I find out which operations are IDE PIO etc? sorry
for asking silly questions, but I couldn't find this anywhere
in the documentation...
thanks in advance
nik
