Re: [Xen-users] XEN - Broadcom issue: survey

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Nov 14, 2007 at 10:29:09PM +0200, Pasi Kärkkäinen wrote:
> On Wed, Nov 14, 2007 at 11:27:44AM -0800, Pezza wrote:
> > 
> > Pasi,
> > 
> > thanks for your reply.
> > 
> > I understood from this and other mailing lists that using an HVM machine
> > with no PV drivers would result in a poor performance, but it would work
> > anyway.
> > My problem is that, due to this packet loss, HVM machines are not usable,
> > because they get some "strange" errors from time to time (session breaks,
> > corrupt files, etc...).
> > So you're saying that lack of PV drivers is the cause and thus that HVM
> > machines are not stable if we don't use PV drivers?
> > 
> 
> Basicly, yes.
> 
> HVM domU hardware emulation (NIC, disk controller, etc) is done by QEMU in
> Xen.
> 
> QEMU people can possibly tell you more about expected performance and 
> problems.
> 
> And I bet you can find many comparisons with some googling.. performance
> with and without PV drivers in HVM domU.
> 

Btw same happens with VMware.. if you don't install "vmware tools"
(=optimized drivers) you're limited to 10 Mbit/sec networking etc..

-- Pasi

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