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[Xen-devel] Why are I/O rings bidirectional?

  • To: xen-devel@xxxxxxxxxxxxxxxxxxxxx
  • From: McGroarty <mcgroarty@xxxxxxxxx>
  • Date: Mon, 7 Feb 2005 16:59:00 -0600
  • Delivery-date: Mon, 07 Feb 2005 23:00:53 +0000
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  • List-id: List for Xen developers <xen-devel.lists.sourceforge.net>
Hello. I am reading Xen and the Art of Virtualization. I am curious as
to why the async I/O ring buffers contain both requests and responses
in the same ring.

I have not seen this done before. Is it not more efficient to have one
ring for each direction? What is the benefit of the single ring?


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