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

[chris <tknchris@xxxxxxxxx>]

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]
>
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>

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