Re: [Libguestfs] Why libguestfs guest exist exceptionally?

On Mon, Sep 29, 2014 at 12:36 AM, Richard W.M. Jones <rjones(a)redhat.com&gt; wrote: > On Sun, Sep 28, 2014 at 11:43:17PM +0800, Zhi Yong Wu wrote: >> Yeah, but why did it happen when i directly issue guest VM via above command? > > OK I see. When libguestfs runs qemu-kvm, it sets up a TCP socket > first [on RHEL 5 -- it works differently upstream]. Without the > socket existing (and sending commands etc), the qemu-kvm command on > its own won't work. I got it, thanks. By the way, i found that virt-xxx usually has very poor performance on my box. e.g. virt-filesystems will return the result in 30s, virt-resize will need 30 minutes to complete resizing one disk. Every virt-xxx need to start one QEMU guest at first every time it is issued, so this takes too long time to run. I am trying to find out some ways to improve its perf.