From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kiszka Subject: High vm-exit latencies during kvm boot-up/shutdown Date: Tue, 23 Oct 2007 01:09:00 +0200 Message-ID: <471D2D8C.1080202@web.de> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1633254431==" To: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --===============1633254431== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig221AE312AAE111AD512B31C4" This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig221AE312AAE111AD512B31C4 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: quoted-printable Hi, I'm seeing fairly high vm-exit latencies (300-400 us) during and only during qemu/kvm startup and shutdown on a Core2 T5500 in 32-bit mode. It's most probably while the VM runs inside bios code. During the rest of the time, while some Linux guest is running, the exit latencies are within microseconds, thus perfectly fine for the real-time scenarios I have in mind. Has anyone some idea what goes on there? As those hundreds of micros precisely frame the assembly block in vmx_vcpu_run, I wonder what guest code could cause such long delays. A quick glance at the bochs bios code did not enlighten me yet. Thanks, Jan --------------enig221AE312AAE111AD512B31C4 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHHS2MniDOoMHTA+kRAn/fAKCC7ai6nEaG6TIvom8tUQDt/yjKDQCfQoNI iVwK8KwfTMaf4GUe6HFiCHE= =zLWt -----END PGP SIGNATURE----- --------------enig221AE312AAE111AD512B31C4-- --===============1633254431== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ --===============1633254431== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ kvm-devel mailing list kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org https://lists.sourceforge.net/lists/listinfo/kvm-devel --===============1633254431==--