Oracle VM Windows Guests I/O Slow - Performance Issue (Doc ID 1086314.1)

Last updated on AUGUST 31, 2014

Applies to:

Oracle VM - Version 2.1 and later
Generic Windows
***Checked for relevance on 1-Sep-2014***


Symptoms

On one or more Windows virtual machines (guests), I/O performance / throughput is extremely low. Checking the DMA mode for storage I/O shows PIO instead of preferred (high performance) Multi-Word DMA Mode 2.

Cause

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