[Xen-devel] The overhead of VCPu migration in xen

["michaeli.zhi" <michaeli.zhi@xxxxxxxxx>]

Hi, everyone.

I did a little study on the code of credit scheduler of xen.

I am confused on overhear of the migration of VCPU .

As I learned, the course of VCPU migration is just to return a "reasonable" VCPU of other peer PCPU

to the PCPU which is busy on other VCPU, as well as some judgments before(eg., comparision of VCPU priority, affintiy). 

In a word, it is just a pointer returned.  

My question is where is the overhead,

or the overhead of executing those load_balance codes is expensive,

or will the migration of VCPU introducing the somekind of cache failure?

 

Best regards

2009-11-20

---

michaeli.zhi

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel