Have you considered not using cfq? Forcing irqpoll is causing lots of other problems. Look in your dmesg log.
** Changed in: linux-source-2.6.17 (Ubuntu)
Importance: Undecided => Low
Assignee: Tim Gardner => Ubuntu Kernel Team
Status: Needs Info => Confirmed
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loading with elevator=cfq forces using of irqpoll
https://launchpad.net/bugs/96575
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