Re: [Xen-users] Xen hard-disk performance regression?

[Fabiano Francesconi <fabiano.francesconi@xxxxxxxxx>]

On Sun, Apr 11, 2010 at 12:16:46PM -0400, chris wrote:
> Just FYI some Atom cpu's do actually have VT. I got my hands on a
> netbook with Atom Z5 series cpu and was able to run a windows guest
> under it.
> 
> http://ark.intel.com/ProductCollection.aspx?familyID=29035
> 
> - chris
> 
> On Sun, Apr 11, 2010 at 11:39 AM, Fabiano Francesconi
> <fabiano.francesconi@xxxxxxxxx> wrote:
> > On Sun, Apr 11, 2010 at 02:55:24PM +0100, Andrew Lyon wrote:
> >> On Sun, Apr 11, 2010 at 11:30 AM, Fabiano Francesconi
> >> <fabiano.francesconi@xxxxxxxxx> wrote:
> >> > Hello there,
> >> > I'm noticing a performance regression for what's matter the hard-disk I
> >> > pass to the domU (aquaria).
> >>
> >>
> >> Have you checked the performance of the disk in dom0?
> >>
> >> >
> >> > The slow-down is very noticeable even when moving small videos file
> >> > (~350mb).
> >> >
> >> > In the configuration file of the domU, I pass the whole disk
> >> > ('phy:/dev/sdb,xvdb,w') to the guest OS.
> >> >
> >> > The distribution under both systems is Gentoo/Linux, x86 arch.
> >> >
> >> > The hypervisor is always the same, in both scenarios (Linux xevelon
> >> > 2.6.32-xen-r1 #1 SMP Sat Apr 10 13:37:02 CEST 2010 i686 Intel(R)
> >> > Atom(TM) CPU 330 @ 1.60GHz GenuineIntel GNU/Linux).
> >> >
> >> > The machine is an Atom, so it's not capable of any VT technology but so
> >> > far it's a great machine and XEN is working just fine on it.
> >> >
> >> > I attach you few logs I've gathered.
> >> >
> >> > Thank you
> >> >
> >> > --
> >> > Fabiano Francesconi [GPG key: 0x81E53461]
> >> >
> >> > _______________________________________________
> >> > Xen-users mailing list
> >> > Xen-users@xxxxxxxxxxxxxxxxxxx
> >> > http://lists.xensource.com/xen-users
> >> >
> >
> > It seems, actually, that something has changed since the performance
> > seems to be restored back to the normality.
> >
> > Mh, I can't explain that.. maybe I had some process keep running CPU
> > high while I was performing that hdparm.
> >
> > I'll keep this thread up-to-date if something changes again.
> >
> > Sorry for this bad report.
> >
> > --
> > Fabiano Francesconi [GPG key: 0x81E53461]
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> >
> 
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It's an Intel(R) Atom(TM) CPU  330   @ 1.60GHz (
http://ark.intel.com/Product.aspx?id=35641&processor=330&spec-codes=SLG9Y
) so it does not have any VT.

-- 
Fabiano Francesconi [GPG key: 0x81E53461]

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