Hi,
Thanks for the hints
, I did experiment with the changes you suggested and now we
were able to achieve the following result : the performance of
the domU is 50 % of the dom0 .
Is it possible to improve these numbers more ?
Also , do you have any advice on where to find extensive
documentation on how to use Xen ?
Thank you
Luca
Il 05/01/2016 15:05, Stefano Stabellini
ha scritto:
There are a few issues in the config files. In conf_DomU_WindowsHVM:
- device_model is set to /usr/lib64/xen/bin/qemu-dm, which is the old
qemu-xen-traditional device model, known to have worse disk
performance. Just delete this line to use the newer QEMU based tree.
- disk is set to [ '/dev/vg0/winvirtio,raw,xvda1,rw' ], but you cannot
expose only a partition of a disk to a Windows HVM domain. The correct
disk line would be: disk = [ '/dev/vg0/winvirtio,raw,hda,rw' ]
In conf_DomU_Xen:
- you are missing builder="hvm", which means you are using a PV guest
rather than an HVM guest. PV guests tends to be slower on new
hardware.
What version of Xen are you using?
On Tue, 5 Jan 2016, Luca Tongiani wrote:
Sorry but I sent these logs because I have no longer available the Virtualizer of Windows DomU .
In any case the problem of the performance of disks is present both in the case of Linux machines PV and Windows
machines HVM .
I attach the complete log of the server and the conf of my HVM Windows Machine.
Thanks again
Il 05/01/2016 13:42, Stefano Stabellini ha scritto:
The xenstore-ls output is not complete. Could you please send it again?
I noticed from the DomU config file that it is not a Windows VM, as
previously discussed, but a Linux VM. That is OK, but of course in that
case you won't be able to use the Windows PV drivers which I linked.
Linux has its own set of drivers. Did you enable the Xen PV frontends in
the Linux kernel you use (/var/xen/boot/vmlinuz-4.0.5-gentoo_bmsbackup)?
Did you compile them a built-in or as modules?
On Tue, 5 Jan 2016, Luca Tongiani wrote:
Hi,
thanks in advance for your reply :)
I have attached the following email configuration DomU and the output you have requested .
Performance disk are all my machines the most serious problem , even if they are used powerful hardware .
Differences in Disk writing in DomU are 1/3 of those of the Dom0 .
Thank you in advance Luca
Il 05/01/2016 12:09, Stefano Stabellini ha scritto:
Could you please post your VM config file and the output of
xenstore-ls once the VM has completed the boot sequence?
On Tue, 5 Jan 2016, Luca Tongiani wrote:
Hi Stefano,
im writing to you because im having issue with I/O disk in my DomU With Xen (Gentoo based system).
I tried to use the driver that you provided for the PV .
But the results are still not good , there is no way to support the use of Xen VirtIO disk ? Many thanks in
advance
Luca
Il 12/16/15 12:31, Stefano Stabellini ha scritto:
Hello Luca,
the recommended way to increase disk performance would be to use Xen PV
disks. You just need to install the Windows PV drivers:
http://www.xenproject.org/developers/teams/windows-pv-drivers.html
But using VirtIO disk should also increase performance, even though
most probably not as much.
Cheers,
Stefano
On Tue, 15 Dec 2015, Luca Tongiani wrote:
Hi to all,
I'm writing you this mail for asking some advice about a great problem i'm havin in running a Windows VM
(HVM) onto a Xen (Gentoo based) Hypevisor.
I need to achieve maximum performance from this VM because of intense SQL tasks running in it.
I've seen good improvement in IO on disk using VirtIO on a Windows VM onto a QEMU (QNAP) hypervisor, and i'm
tryin to use this feature also on my Xen HV.
Is VirtIO disk a good way to improve performance?
Thx in advance and hope to keep in touch
--
Luca Tongiani
Sinte srl
Soluzioni Informatiche e Telematiche
via Monte Grappa 4/B
20900 Monza (MB)
Cel (+39) 339 745 49 21
Tel (+39) 039 200 59 60
Fax (+39) 039 200 69 42
Web www.sinte.net
--
Luca Tongiani
Sinte srl
Soluzioni Informatiche e Telematiche
via Monte Grappa 4/B
20900 Monza (MB)
Tel (+39) 039 200 59 60
Fax (+39) 039 200 69 42
Web www.sinte.net
--
Luca Tongiani
Sinte srl
Soluzioni Informatiche e Telematiche
via Monte Grappa 4/B
20900 Monza (MB)
Tel (+39) 039 200 59 60
Fax (+39) 039 200 69 42
Web www.sinte.net
--
Luca Tongiani
Sinte srl
Soluzioni Informatiche e Telematiche
via Monte Grappa 4/B
20900 Monza (MB)
Tel (+39) 039 200 59 60
Fax (+39) 039 200 69 42
Web www.sinte.net
--
Luca Tongiani
Sinte
srl
Soluzioni Informatiche e Telematiche
via Monte Grappa 4/B
20900 Monza (MB)
Tel (+39) 039 200 59 60
Fax (+39) 039 200 69 42
Web www.sinte.net
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