From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olaf Hering <olaf@aepfle.de>
Subject: Re: superpages lost after migration of HVM domU
Date: Thu, 20 Apr 2017 18:04:01 +0200
Message-ID: <20170420160401.GH4645@aepfle.de>
References: <20170420153523.GG4645@aepfle.de>
 <104ce757-2105-774e-f421-5ee07f5acb0b@citrix.com>
Mime-Version: 1.0
Content-Type: multipart/mixed; boundary="===============4240318339258785170=="
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <104ce757-2105-774e-f421-5ee07f5acb0b@citrix.com>
List-Unsubscribe: <https://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
 <mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <https://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
 <mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Errors-To: xen-devel-bounces@lists.xen.org
Sender: "Xen-devel" <xen-devel-bounces@lists.xen.org>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: xen-devel@lists.xen.org
List-Id: xen-devel@lists.xenproject.org


--===============4240318339258785170==
Content-Type: multipart/signed; micalg=pgp-sha1;
	protocol="application/pgp-signature"; boundary="Uu2n37VG4rOBDVuR"
Content-Disposition: inline


--Uu2n37VG4rOBDVuR
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline

On Thu, Apr 20, Andrew Cooper wrote:

> As it currently stands, the sending side iterates from 0 to p2m_size,
> and sends every frame on the first pass.  This means we get PAGE_DATA
> records linearly, in batches of 1024, or two aligned 2M superpages.

Is there a way to preserve 1G pages? This 380G domU I'm looking at is
built with 4k:461390 2M:2341 1G:365 pages.

Was there any performance testing done with the new code? I think the
15-20% degradion we are seeing might be caused by this.


Olaf

--Uu2n37VG4rOBDVuR
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----

iF0EARECAB0WIQSkRyP6Rn//f03pRUBdQqD6ppg2fgUCWPjb7gAKCRBdQqD6ppg2
fg1zAJ9gF+yD4FxjrrV53SLj2WvMrPz8tACg+XInuxp+TaFF9v9cM1uOcm42zJc=
=VF9l
-----END PGP SIGNATURE-----

--Uu2n37VG4rOBDVuR--


--===============4240318339258785170==
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
Content-Disposition: inline

X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KWGVuLWRldmVs
IG1haWxpbmcgbGlzdApYZW4tZGV2ZWxAbGlzdHMueGVuLm9yZwpodHRwczovL2xpc3RzLnhlbi5v
cmcveGVuLWRldmVsCg==

--===============4240318339258785170==--