RE: [Xen-devel] Auto CPU rebalance ?

To:	"John Levin" <xenjohn@xxxxxxxxx>, "Matsumoto" <n_matumoto@xxxxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	RE: [Xen-devel] Auto CPU rebalance ?
From:	"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date:	Thu, 29 Dec 2005 22:05:35 -0000
Delivery-date:	Thu, 29 Dec 2005 22:10:03 +0000
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Thread-topic:	[Xen-devel] Auto CPU rebalance ?

> Also is any scheduler going to include any algorthm to handle 
> gang scheduling of multiplie vcpus?

It remains to be seen whether gang scheduling is actually necessary. I'd
like to see how well some combination of "bad pre-emption"
avoidance/mitigation coupled with biasing the scheduler to run vcpu's of
domains that already have vcpu's running. 

Strict gang scheduling is likely to lead to a lot of wasted cycles, and
I expect we can do better. The first step is to define a set of
workloads we want to optimise for, and collect some traces. 

Ian  

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