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Re: [Qemu-devel] Effect of qemu-img convert -m and -W options
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From: |
Richard W.M. Jones |
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Subject: |
Re: [Qemu-devel] Effect of qemu-img convert -m and -W options |
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Date: |
Thu, 16 Nov 2017 18:00:54 +0000 |
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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:
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
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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