Re: [Libguestfs] [Qemu-devel] Effect of qemu-img convert -m and -W options

On Thu, Nov 16, 2017 at 05:30:48PM +0000, Stefan Hajnoczi wrote: > On Thu, Nov 16, 2017 at 3:10 PM, Richard W.M. Jones <rjones(a)redhat.com&gt; wrote: > > Both local filesystems, but on different SATA devices. > > Okay. I'm curious what the strace -f output looks like (only the > preadv(2)/pwritev(2) syscalls are interesting at the moment). Here's the full strace from one run: http://oirase.annexia.org/tmp/strace.xz The command is (with the output.qcow2 file created in a previous run): $ strace -o /tmp/strace -f -s 1024 qemu-img convert -f raw fedora-27.img -O qcow2 /var/tmp/output.qcow2 -m 8 -W -n The version of qemu is: qemu-2.10.0-7.fc28.x86_64