| Message ID | 20180711012227.31600-1-famz@redhat.com |
|---|---|
| State | New |
| Headers | show |
| Series | qemu-img: Document copy offloading implications with -S and -c | expand |
Am 11.07.2018 um 03:22 hat Fam Zheng geschrieben: > Explicitly enabling zero detection or compression suppresses copy > offloading during convert. Document it. > > Suggested-by: Kevin Wolf <kwolf@redhat.com> > Signed-off-by: Fam Zheng <famz@redhat.com> Thanks, applied to the block branch. Kevin
On Wed, Jul 11, 2018 at 09:22:27AM +0800, Fam Zheng wrote: > Explicitly enabling zero detection or compression suppresses copy > offloading during convert. Document it. > > Suggested-by: Kevin Wolf <kwolf@redhat.com> > Signed-off-by: Fam Zheng <famz@redhat.com> > --- > qemu-img.texi | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/qemu-img.texi b/qemu-img.texi index aeb1b9e66c..5853cd18d1 100644 --- a/qemu-img.texi +++ b/qemu-img.texi @@ -96,7 +96,8 @@ will enumerate information about backing files in a disk image chain. Refer below for further description. @item -c -indicates that target image must be compressed (qcow format only) +indicates that target image must be compressed (qcow format only). If this +option is used, copy offloading will not be attempted. @item -h with or without a command shows help and lists the supported formats @@ -115,7 +116,8 @@ in case both @var{-q} and @var{-p} options are used. indicates the consecutive number of bytes that must contain only zeros for qemu-img to create a sparse image during conversion. This value is rounded down to the nearest 512 bytes. You may use the common size suffixes like -@code{k} for kilobytes. +@code{k} for kilobytes. If this option is used, copy offloading will not be +attempted. @item -t @var{cache} specifies the cache mode that should be used with the (destination) file. See
Explicitly enabling zero detection or compression suppresses copy offloading during convert. Document it. Suggested-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Fam Zheng <famz@redhat.com> --- qemu-img.texi | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)