Xen devel - Jul 2008 - qcow disk performance not exceeding 3.0MB/s

I am using a sparse image with a backed file. Using a dd inside domU the 
performance doesn''t exceed 3.0MB/s. If I try this on an NFS mount the 
performance (in an uninitialized qcow image) is below 1.0MB/s.

Is this as expected? Are there currently any improvements in the Xen 3.3 
hg repo that increase speed in the blktap backend?


Stefan

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