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

To:	"xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	[Xen-devel] The overhead of VCPu migration in xen
From:	"michaeli.zhi" <michaeli.zhi@xxxxxxxxx>
Date:	Fri, 20 Nov 2009 15:26:28 +0800
Delivery-date:	Thu, 19 Nov 2009 23:26:27 -0800
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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

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