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qemu-img: dynamically adjust iobuffer size during convert
since the convert process is basically a sync operation it might be benificial in some case to change the hardcoded I/O buffer size to a greater value. This patch increases the I/O buffer size if the output driver advertises an optimal transfer length or discard alignment that is greater than the default buffer size of 2M. Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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