Hi, While investigating the cause for the performance discrepancy of Virtualbox on NOVA vs hw_x86_64[_muen] [1], I have determined, with help from Alexander, that Virtualbox thread priorities [2] are not applied on base-hw. Even though priorities are specified when constructing the Cpu_connection [3], they have no effect since no quota is subsequently assigned/transferred. According to the 14.11 release notes [4], threads without quota have no guarantee to be scheduled and their priority is ignored. I believe this is the main cause for the difference in execution speed of Virtualbox on NOVA and base-hw.
I was wondering if you could confirm my analysis of the issue and provide some pointers on how to best achieve the proper application of Virtualbox thread priorities on base-hw. Regards, Adrian [1] - Even in recompiler-only mode the guest execution on NOVA is considerably faster than on hw_x86_64 or hw_x86_64_muen [2] - https://www.virtualbox.org/browser/vbox/trunk/include/iprt/thread.h#L90 [3] - https://github.com/genodelabs/genode/blob/master/repos/ports/src/virtualbox/thread.cc#L56 [4] - http://genode.org/documentation/release-notes/14.11#Trading_CPU_time_between_components_using_the_HW_kernel ------------------------------------------------------------------------------ Don't Limit Your Business. Reach for the Cloud. GigeNET's Cloud Solutions provide you with the tools and support that you need to offload your IT needs and focus on growing your business. Configured For All Businesses. Start Your Cloud Today. https://www.gigenetcloud.com/ _______________________________________________ genode-main mailing list genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
