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IODemoryDescriptor->prepare() Performance relateted to the kIODirection?

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IODemoryDescriptor->prepare() Performance relateted to the kIODirection?

Subject: IODemoryDescriptor->prepare() Performance relateted to the kIODirection?
From: devmaillists <email@hidden>
Date: Thu, 11 Jan 2007 17:00:44 +0100

Hello Darwin-kernel List,

I have some question regarding the speed of IODemoryDescriptor- >prepare(). Does the direction have an impact on the speed "prepare" needs to complete? And further more does the direction have an impact on DMA speed a PCIe Busmaster can reach on the prepared memory?

Thank you very much.

Jürgen _______________________________________________
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