From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gerd Hoffmann Subject: Re: [RFC] Paravirt timer for KVM Date: Tue, 16 Oct 2007 10:15:25 +0200 Message-ID: <4714731D.4040408@redhat.com> References: <5d6222a80710120908s6b1f5845head84e7b7a463cd1@mail.gmail.com> <1192218507.14891.18.camel@basalt> <470FD2CA.1000702@codemonkey.ws> <1192226137.14891.111.camel@basalt> <470FF036.6080803@codemonkey.ws> <10EA09EFD8728347A513008B6B0DA77A023A6DCE@pdsmsx411.ccr.corp.intel.com> <1192464113.25377.0.camel@basalt> <47139994.4030606@qumranet.com> <1192489540.22523.32.camel@basalt> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel , Jeremy Fitzhardinge , Avi Kivity To: Hollis Blanchard Return-path: In-Reply-To: <1192489540.22523.32.camel@basalt> 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 Hollis Blanchard wrote: > That's a good point, but does PIT/HPET emulation show up as a hot spot > in any profiles? I think keeping the hypercall API as small as feasible > is a desirable design goal. pit probably doesn't due to being rarely updated. For hpet I'd expect it showing up much more. Asking for current time is a quite frequent operation in the linux kernel. I've had X86_CR4_TSD set for a while and saw *lots* of rdtsc traps then ... cheers, Gerd ------------------------------------------------------------------------- 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/