* [Qemu-devel] [PATCH] qemu-img: Document copy offloading implications with -S and -c
@ 2018-07-11 1:22 Fam Zheng
2018-07-11 10:24 ` Kevin Wolf
2018-07-11 13:27 ` [Qemu-devel] [Qemu-block] " Stefan Hajnoczi
0 siblings, 2 replies; 3+ messages in thread
From: Fam Zheng @ 2018-07-11 1:22 UTC (permalink / raw)
To: qemu-devel; +Cc: Kevin Wolf, Max Reitz, qemu-block
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(-)
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
--
2.17.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [PATCH] qemu-img: Document copy offloading implications with -S and -c
2018-07-11 1:22 [Qemu-devel] [PATCH] qemu-img: Document copy offloading implications with -S and -c Fam Zheng
@ 2018-07-11 10:24 ` Kevin Wolf
2018-07-11 13:27 ` [Qemu-devel] [Qemu-block] " Stefan Hajnoczi
1 sibling, 0 replies; 3+ messages in thread
From: Kevin Wolf @ 2018-07-11 10:24 UTC (permalink / raw)
To: Fam Zheng; +Cc: qemu-devel, Max Reitz, qemu-block
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [Qemu-block] [PATCH] qemu-img: Document copy offloading implications with -S and -c
2018-07-11 1:22 [Qemu-devel] [PATCH] qemu-img: Document copy offloading implications with -S and -c Fam Zheng
2018-07-11 10:24 ` Kevin Wolf
@ 2018-07-11 13:27 ` Stefan Hajnoczi
1 sibling, 0 replies; 3+ messages in thread
From: Stefan Hajnoczi @ 2018-07-11 13:27 UTC (permalink / raw)
To: Fam Zheng; +Cc: qemu-devel, Kevin Wolf, qemu-block, Max Reitz
[-- Attachment #1: Type: text/plain, Size: 411 bytes --]
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>
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-07-11 1:22 [Qemu-devel] [PATCH] qemu-img: Document copy offloading implications with -S and -c Fam Zheng
2018-07-11 10:24 ` Kevin Wolf
2018-07-11 13:27 ` [Qemu-devel] [Qemu-block] " Stefan Hajnoczi
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