This actually turns out to be related to dd's default block size. By
default, dd uses a block size of 512. The effect of this is that qemu
fills the pipe buffer very quickly because dd just is submitting very
small requests (that will require a RMW).
If you set an explict block size with dd (via bs=1M), you'll notice a
significant improvement in throughput.
So I think this turns out to be a libvirt issue, not a qemu issue.
** Changed in: qemu
Status: Confirmed => Invalid
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virsh save is very slow
https://bugs.launchpad.net/bugs/524447
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