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Re: [Xen-devel] qemu-xen qdisk performance

To: Roger Pau MonnÃ <roger.pau@xxxxxxxxxxxxx>
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Mon, 13 Feb 2012 11:59:28 +0000
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
Delivery-date: Mon, 13 Feb 2012 11:55:44 +0000
List-id: Xen developer discussion <xen-devel.lists.xensource.com>

On Mon, 13 Feb 2012, Roger Pau MonnÃ wrote:
> > Yes, great improvements.
> > The old qemu-xen uses threads to simulate async IO so it is very slow;
> > upstream QEMU uses Linux AIO and is much faster.
> 
> That's great news, so qdisk performance in qemu-upstream should be
> similar to blktap?

Slightly better actually, from my very quick and dirty tests.

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