vSMP
Scheduling 2+ vCPUs in a VM, ESX2 used a "Strict Co-Scheduling" technique where a skew value for each vCPU was tracked & increased when vCPUs were at different progress levels. With enough skew, the entire VM was descheduled. The co-scheduling algorithm was improved to a "Relaxed Co-Scheduling" scheme in ESX3 (and vSphere) resulting in a significant reduction of co-scheduling fragmentation.
See http://bit.ly/yplYU
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Scheduling 2+ vCPUs in a VM, ESX2 used a "Strict Co-Scheduling" technique where a skew value for each vCPU was tracked & increased when vCPUs were at different progress levels. With enough skew, the entire VM was descheduled. The co-scheduling algorithm was improved to a "Relaxed Co-Scheduling" scheme in ESX3 (and vSphere) resulting in a significant reduction of co-scheduling fragmentation.
See http://bit.ly/yplYU
More vQuotes
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