Optimized virtual interrupt delivery in ESX 4.0 improves the performance of some Linux guests. On an I/O completion, previous versions of ESX scheduled the vCPU that originated the I/O request. If this vCPU was found to not be the target vCPU chosen by the guest for further processing the I/O completion interrupt request, the VMM forwarded the I/O completion to the correct target vCPU with an additional inter-processor interrupt. ESX 4.0 avoids the need for these additional interrupts by predicting which vCPU is the target of a particular IRQ and delivering the I/O completion to it instead of to the originating vCPU. This reduces the CPU overhead substantially.
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