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

From: Richard W.M. Jones
Subject: Re: [Qemu-devel] Effect of qemu-img convert -m and -W options
Date: Thu, 16 Nov 2017 18:00:54 +0000
User-agent: Mutt/1.5.20 (2009-12-10)

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 <address@hidden> 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:


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


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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