Re: libvirt, xen PV, qemu-system-i386, root user

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On Mon, Sep 07, 2015 at 05:47:39PM +0200, Karel Hendrych wrote:
> ...
> 
> changing from: <driver name='file'/> to: <driver name='tap2'/> makes
> the domain start without QEMU.
> 
> However I see much better performance with QEMU (close to dom0,
> tested using simple dd writes) than with tap2 driver. Is that
> expected?
> 

How did you measure it? buffered or direct io? 


-- Pasi


> What's best practise to file based storage on latest CentOS6-xen
> (Kernel 3.18.17, Xen 4.4.2-7)
> 
> Are there any guides around running QEMU on CentOS6-xen as non-root user?
> 
> Cheers
> --
> Karel
> 
> On 7.9.2015 17:42, Karel Hendrych wrote:
> >Hi, spot on!
> >
> >
> >On 6.9.2015 12:56, Pasi Kärkkäinen wrote:
> >>On Sun, Sep 06, 2015 at 09:08:50AM +0200, Karel Hendrych wrote:
> >>>Hi, after migrating to libvirt/libxl according to:
> >>>
> >>
> >>Hi,
> >>
> >>>https://wiki.centos.org/HowTos/Xen/Xen4QuickStart/Xen4Libvirt
> >>>
> >>>I've noticed that my Xen PV domains are being launched by
> >>>qemu-system-i386 running under root privileges.
> >>>
> >>>I am wondering why is this? Previously no qemu process was used.
> >>>
> >>>If qemu is needed for some reason, are there any guidelines for
> >>>non-root operation?
> >>>
> >>
> >>In general qemu is used for the following purposes:
> >>
> >>- for certain domU disk backend types (image files), and/or if there's
> >>no blktap driver in dom0 kernel.
> >>- domU graphical console (PVFB) VNC server, if it's enabled for the domU.
> >>
> >>
> >>>--
> >>>Karel Hendrych
> >>
> >>
> >>-- Pasi
> >>
> >>_______________________________________________
> >>CentOS-virt mailing list
> >>CentOS-virt@xxxxxxxxxx
> >>https://lists.centos.org/mailman/listinfo/centos-virt
> >>
> _______________________________________________
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