From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: windows domU disk performance graph comparing hvm
	vs  stubdom vs pv drivers
Date: Tue, 23 Feb 2010 15:03:44 -0500
Message-ID: <20100223200344.GA22402@phenom.dumpdata.com>
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	<alpine.DEB.2.00.1002221516330.2037@kaball-desktop>
	<5411dbdc1002220914m2cf15fack76aed42a4fca1a32@mail.gmail.com>
	<alpine.DEB.2.00.1002221725080.2037@kaball-desktop>
	<5411dbdc1002221313y59866dd2k3ba528fe2b5499d@mail.gmail.com>
	<alpine.DEB.2.00.1002231220090.2037@kaball-desktop>
	<20100223144424.GB25741@phenom.dumpdata.com>
	<20100223193926.GX2761@reaktio.net>
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To: Pasi =?iso-8859-1?Q?K=E4rkk=E4inen?= <pasik@iki.fi>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, Keith Coleman <list.keith@scaltro.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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On Tue, Feb 23, 2010 at 09:39:26PM +0200, Pasi K=E4rkk=E4inen 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 bette=
r
> > > > > disk bandwidth with stubdoms compared to qemu running in dom0.
> > > > >
> > > >=20
> > > > What type of test are you doing?
> > > >=20
> > >=20
> > > these are the results I got a while ago running a simple "dd if=3D/=
dev/zero
> > > of=3Dfile" for 10 seconds:
> >=20
> > Keep in mind that iometer (both the Windows a Linux version) by defau=
lt
> > do random seak of 50% reads and 50% writes. They do have some set of
> > templates - "web server", "file server", "database server" that chang=
e
> > 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).
> >=20
>=20
> Does iometer run correctly on Linux nowadays? I remember it having prob=
lems
> with more than 1 outstanding IO..

It seems to work for me. Thought if you download it from their web-site
expect to hack a bit of their module to make it work with new kernels.