[Xen-devel] Does Xen scheduler preserves 5% of its utilization to every VM?

[walmart <vmwalmart@xxxxxxxxx>]

Hi, all

I was trying to write a Xen scheduler, it is a fixed priority one and
would give domain 1 higher priority than domain 2. (which means
whenever domain 1 is runnable, it got the cpu to run).

I got two domains running. It is on Fedora 13, 64 bit, Xen 4.0.1.

domain 1 and doman 2 both only have one vcpu, and are pinned to the same core.

The strange thing is:

domain 1 is busy, domain 2 is idle, domain 1 got 95% of the cpu;
domain 1 is idle, domain 2 is busy, domain 2 got 95% of the cpu;
domain 1 is busy, domain 2 is busy, domain 1 got 95% of the cpu, while
domain 2 got the remaining 5%.

I checked the schedule() function again and again, still couldn't
figure out why would this happen.

Could anyone give me some hint?


thanks very much!

Best!

Sam

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