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[Xen-devel] overheads of having lots of pages granted at a time

  • To: "xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
  • Date: Sat, 15 Dec 2007 13:11:20 +1100
  • Delivery-date: Fri, 14 Dec 2007 18:11:53 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: Acg+v8hd9KSrLDB/TqyPVo6W3U1Plw==
  • Thread-topic: overheads of having lots of pages granted at a time

Because of some windows limitations, I am going to have to pre-allocate
page aligned buffer space for block device i/o at device setup, and copy
data between the buffer space I get in each i/o request and the buffer
space I've pre-allocated.

My options are to either grant the pages at the time I allocate them, or
to grant and ungrant each page as I submit the i/o request to xen.

>From a performance point of view, is there any problem having lots of
pages granted when you aren't using them?



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