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[win-pv-devel] Question about XENVBD_MAX_REQUESTS_PER_SRB

  • To: "win-pv-devel@xxxxxxxxxxxxxxxxxxxx" <win-pv-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: "Lai, Ethan" <yishengl@xxxxxxxxxx>
  • Date: Fri, 25 Mar 2016 23:02:36 +0000
  • Accept-language: en-US
  • Delivery-date: Fri, 25 Mar 2016 23:03:03 +0000
  • List-id: Developer list for the Windows PV Drivers subproject <win-pv-devel.lists.xenproject.org>
  • Thread-index: AdGG6J0Vnq6qNCCuT6OBD7Y2hq9+yQ==
  • Thread-topic: Question about XENVBD_MAX_REQUESTS_PER_SRB

Hi,

 

I’m curious that why XENVBD_MAX_REQUESTS_PER_SRB is set to 16. Is it because that XENVBD_MAX_RING_PAGES is also 16?

 

If the XENVBD_MAX_REQUESTS_PER_SRB is set to 1, then there will be one to one mapping between srb and xenvbd request, which make things simpler. i.e. count in SrbExt would be saved, and it is possible to reuse storport’s queue to hold prepared requests.

 

Best,

Ethan

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