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Re: XEN 4.11 and 9.99.48 DOMU performance
I wonder if the issue is that the dom0 is single threaded, serializing
all the IO.
Have you done dd bs=1m from the dom0 raw disk, the dom0 backing file,
and the domU ('raw disk')? I used to see X, 0.9X, and (0.9)^2 X, ish,
on somewhat old Xen and older NetBSD.
I would run "systat vmstat" in the domU, to see the disk busy fraction
and transfer rate.
I also wonder if there is some sort of fsync in the domU leading to
virtual FUA leading to fsync in the dom0 going on.
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