Xen Domains scheduling parameters do not take effect before rebooting

[Priya <pbhat@acis.ufl.edu>]

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Dear all,

I am not observing a change in the performance of my hardware-assisted
virtual machines (HVMs) when I change the scheduling parameters (weight and
cap) associated with the HVMs unless they are rebooted.

I am testing using 2 HVMs running Linux kernels (2.6.24-26-generic) in the
guest operating system. My hardware is 1 x Intel(R) Core(TM)2 Duo CPU
E8400 @ 3.00GHz. I have pinned my Domain-0 to physical CPU-0 and the 2 HVMs
to physical CPU-1. In order create a load on my HVMs I run the "glxgears"
API and monitor the performance using "xentop" (and from the movement of the
gears, on the pop-up screen). I use the "xe" CLI to set and check the
scheduling parameters.

I have experimented with setting the cap and weight of one domains to the
least  possible value (1, 1 respectively) and that of the other to the
maximum possible value (0 and 65536 respectively), the initial cap and
weight of both domains being at the default setting of 0 and 256, but the
processor utilization remains unchanged (at 50% for both domains) unless I
reboot my HVMs. Once I do that, I can see the expected (enormous) difference
in the performance.

Is it not possible to change processor utilization without having to reboot
the HVMs? What am I missing here?
Please help!


-- 
Priya Bhat

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