[Xen-devel] atropos still broken?

[Diwaker Gupta <diwakergupta@xxxxxxxxx>]

Hi everyone,

This is for Xen 2.0.3. I'm really interested in the functionality of
atropos (enforcing CPU partitioning in a non work-conserving fashion).
As I had reported earlier, atropos seemed broken in 2.0. It still
seems broken now:

$ xm list
Name              Id  Mem(MB)  CPU  State  Time(s)  Console
Domain-0           0      123    0  r----     49.1
vm1                1       47    0  -b---     29.7    9601

$ xm atropos 0 10000 100000 50000 1
$ xm atropos 0 70000 100000 50000 1

Now if I run the slurp program (posted earlier in this list) in vm1,
it eats up all the CPU. If I start the same program in dom0 as well,
both get ~50% of the CPU. With those parameters, ideally vm1 should be
getting 70% and no more, and dom0 should be getting 10% and no more.

So it seems atropos is still broken. Is a fix being worked upon? I'd
really like to help in any way I can. I'm familiar with the Xen
scheduling code; if any of the developers have any idea of where/what
the bug is, I'd like to take a crack at it.

Thanks,
-- 
Diwaker Gupta
http://resolute.ucsd.edu/diwaker


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