I am running Windows XP as host and Ubuntu 8.10 with Linux 2.6.24.7-rt27 (real-time preemption) as guest. I wonder how the high precision timer is affected by the use of virtualbox in this setup. I can perceive a few scenarios myself: 1) The timer runs without interference of the virtualization. The only effect is that the host affects the guest by delaying its execution. 2) In the switch between host and guest, the value of the timer is saved and restored. The effect is that in terms of execution time, there is no delays due to the host system. However, w.r.t. absolute time there is a devation that goes undetected unless the system clock is accessed. 3) The timer does not work. My test programs gives the impression that it works, so I have discared this scenario.
-- Carpe Diem! === Jonas Mellin, Assistant Professor in Computer Science School of Humanities and Informatics, Building E-2 University of Skövde, P.O. Box 408, SE-541 28 Skövde, Sweden Phone: +46 500 448321, Fax: +46 500 448399 PGP Public Key: http://www.his.se/PageFiles/19377/Jonas_Mellin.asc Email: [email protected], URL: http://www.his.se/melj, ----BEGIN GEEK CODE BLOCK---- GCS d s a+ C++ UL++ US++ P++ L++ E++ W++ N+ o K- w++ O- M V-- PS- PE+ Y+ PGP t+ 5 X R* tv- b++ DI+ D+ G+ y++++ e++++ h--- r+++ ----END GEEK CODE BLOCK----
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