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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Nov 14, 2007 at 01:27:58PM -0800, Pezza wrote:
> 
> Pasi,
> 
> yes, definitely.
> 
> But, as I said, I'm not interested in performance here, just stability.
> VMWare is slow without pv, but is stable (I can download gigs of data from
> machines on the same network with no problems; I can't do the same with a
> Xen vm at the moment), while Xen, as of your words, is unstable without PV.
> 
> Right?
> 

Hmm.. it shouldn't be _unstable_ without PV drivers..

which version of Xen? Whist dom0 distribution and kernel? 

Which guest OS?

-- Pasi

>                                                                           
> M.
> 
> 
> Pasi Kärkkäinen wrote:
> > 
> > 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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