On 27/01/2009 05:38, "Protti, Duilio J" <duilio.j.protti@xxxxxxxxx> wrote:
> - Is the behavior ok? We mean, we consider that this interference is
> undesirable for certain deployments (anyone with paravirtualized and HVM
> guests in the same box, like in example Linux+Windows2003, and you want a fair
> share of the disk transfer rate). What we are asking is if this is a
> consequence of the Xen design and a known behavior, and if there is a
> workaround to ameliorate the interference (the problem persists and in the
> same degree even if both guests perform writes below dom0's dirty_ratio).
Run PV drivers in the HVM guest. This will automatically mean the HVM guest
is using a more efficient data channel, of the same sort as the PV guest. If
you need further fairness guarantees you can make use of one of Linux's fair
queuing disc schedulers.
 -- Keir
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