Comparing simple dd bs=1M count=10000 on dom0 vs domU. Qemu driver is achieving pretty much the same like dom0. Thanks -- Karel On 7.9.2015 21:45, Pasi Kärkkäinen wrote: > 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 at centos.org >>>> https://lists.centos.org/mailman/listinfo/centos-virt >>>> >> _______________________________________________ >> CentOS-virt mailing list >> CentOS-virt at centos.org >> https://lists.centos.org/mailman/listinfo/centos-virt > _______________________________________________ > CentOS-virt mailing list > CentOS-virt at centos.org > https://lists.centos.org/mailman/listinfo/centos-virt >