Re: windows domU disk performance graph comparing hvm vs stubdom vs pv drivers

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Tue, Feb 23, 2010 at 09:39:26PM +0200, Pasi Kärkkäinen 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..

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.