From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kiszka Subject: Re: High vm-exit latencies during kvm boot-up/shutdown Date: Tue, 23 Oct 2007 16:44:57 +0200 Message-ID: <471E08E9.8040606@siemens.com> References: <471D2D8C.1080202@web.de> <10EA09EFD8728347A513008B6B0DA77A02441127@pdsmsx411.ccr.corp.intel.com> <471D96DC.7070809@web.de> <10EA09EFD8728347A513008B6B0DA77A024414D9@pdsmsx411.ccr.corp.intel.com> <471DBA1A.2080108@web.de> <471DC311.2050003@qumranet.com> <471DF76B.7040001@siemens.com> <471E02F7.6080408@qumranet.com> <471E0818.6060405@siemens.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org To: Avi Kivity Return-path: In-Reply-To: <471E0818.6060405-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org> 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 Jan Kiszka wrote: > Avi Kivity wrote: >> Seeing vmx_vcpu_run() in there confuses me, as it always runs with >> interrupts disabled (it does dispatch NMIs, so we could be seeing an NMI). > > The point is that the cyclictest does not find large latencies when kvm > is not happening to start or stop right now. And if you are thinking > about NMIs triggered by the kvm code on vm-exit: I also instrumented > that code path, and it is not taken in case of the long delay. Actually, that instrumentation was for an older version. In this one here, the vm-entry/exit block is clearly framed by traced vmcs_xxx calls. Jan -- Siemens AG, Corporate Technology, CT SE 2 Corporate Competence Center Embedded Linux ------------------------------------------------------------------------- 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/