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Re: [Xen-devel] windows domU disk performance graph comparing hvm vs st

To: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] windows domU disk performance graph comparing hvm vs stubdom vs pv drivers
From: Marco Sinhoreli <msinhore@xxxxxxxxx>
Date: Tue, 23 Feb 2010 17:47:28 -0300
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References: <5411dbdc1002191441q4becdba9o61168bc986533e6@xxxxxxxxxxxxxx> <alpine.DEB.2.00.1002221516330.2037@kaball-desktop> <5411dbdc1002220914m2cf15fack76aed42a4fca1a32@xxxxxxxxxxxxxx> <alpine.DEB.2.00.1002221725080.2037@kaball-desktop> <5411dbdc1002221313y59866dd2k3ba528fe2b5499d@xxxxxxxxxxxxxx> <alpine.DEB.2.00.1002231220090.2037@kaball-desktop> <20100223144424.GB25741@xxxxxxxxxxxxxxxxxxx> <20100223193926.GX2761@xxxxxxxxxxx>
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Hi Keith,

Do you have some KVM graph? It will be interesting to compare both.


Cheers

On Tue, Feb 23, 2010 at 4:39 PM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
On Tue, Feb 23, 2010 at 09:44:24AM -0500, Konrad Rzeszutek Wilk wrote:
> > > > That is strange because in that configuration I get a far better
> > > > disk bandwidth with stubdoms compared to qemu running in dom0.
> > > >
> > >
> > > What type of test are you doing?
> > >
> >
> > these are the results I got a while ago running a simple "dd if=/dev/zero
> > of=file" for 10 seconds:
>
> Keep in mind that iometer (both the Windows a Linux version) by default
> do random seak of 50% reads and 50% writes. They do have some set of
> templates - "web server", "file server", "database server" that change
> the read/write ratio, size of blocks, and the queue length.(fyi, you can
> use fio to set the same values, if you can't get dynamo to compile on
> your Linux box).
>

Does iometer run correctly on Linux nowadays? I remember it having problems
with more than 1 outstanding IO..

-- Pasi


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--
Marco Sinhoreli
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