From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joanna Rutkowska Subject: Noticeably poor Intel GPU performance on 3.3 and 3.4 dom0 kernels Date: Wed, 30 May 2012 12:14:07 +0200 Message-ID: <4FC5F2EF.7000004@invisiblethingslab.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============5675379798603481970==" Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: "xen-devel@lists.xensource.com" Cc: Marek Marczykowski List-Id: xen-devel@lists.xenproject.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --===============5675379798603481970== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigDBB596F6F061BA089EAE41F6" This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigDBB596F6F061BA089EAE41F6 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hello, I've recently been some newer Dom0 kernels (3.3.5, 3.4) under Xen 4.1.2, and have noticed that those kernel noticeably downgrade performance of (at least) Intel GPUs. This is easily noticeable even on such trivial tasks as scrolling a webpage in Firefox or Chrome. This slow GPU performance on 3.3 and 3.4 kernels is in stark contrast with what I see on 3.2.7 Dom0 kernel, where graphics works just great... In order to make sure that this is not caused by power management set too strictly, I played with xenpm and made sure to set the following: 1) xenpm set-scaling-governor performance 2) xenpm set-max-cstate 0 I have verified then that my processor: 1) keeps staying in P0 state (so, max frequency), and 2) keeps staying in C0 state. Those setting didn't change anything regarding the poor graphics performance, though. Any ideas what else I could test to find out the cause of this? Thanks, joanna. --------------enigDBB596F6F061BA089EAE41F6 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEcBAEBAgAGBQJPxfLvAAoJEDaIqHeRBUM01p4H/RMSZZScGV0rOJZEFd180ZHq 88t3JW5YgkKHue5BIMm5pVzBL75a2u/Xkaog035QehP4fVQ5Eyr/Cs6UpdGX/DGL J/w3JOVDNCvJCHNyO4xTAxbK1gLIH7B8VoqUehDZ3WlEsztRlilDv9j+Zm7JDLWI 15uv+KQGCHv1CKGfpoA7RDokOD6uNRm6L3+cmVxZDC4EGZdDHNz59qN2a1buH/xY 4BmrT2Y264JF8VescrEg7S3iYNphuIxCYrvXXzq2Wjz+9bnyHOGyV3NFeC/ddoL1 vHGYmb6WvY+BfzKPZo8CaDN6OKXi5K9P0IDQlrhGERruTXTmYoKXrcehFxoxM5o= =4DEe -----END PGP SIGNATURE----- --------------enigDBB596F6F061BA089EAE41F6-- --===============5675379798603481970== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel --===============5675379798603481970==--