If the I/O elevator of disk is not cfq, the setting
of blkio.weight is ineffective. And the setting up
blkio.weight_device will fail.
Add notification for this situation.
Signed-off-by: Gao feng <gaofeng@xxxxxxxxxxxxxx>
---
docs/formatdomain.html.in | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 47d91ab..8d048be 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -740,7 +740,8 @@
<dd> The optional <code>blkiotune</code> element provides the ability
to tune Blkio cgroup tunable parameters for the domain. If this is
omitted, it defaults to the OS provided
- defaults. <span class="since">Since 0.8.8</span></dd>
+ defaults. Notice: blkiotune is effective only when the I/O elevator
+ of disk is cfq. <span class="since">Since 0.8.8</span></dd>
<dt><code>weight</code></dt>
<dd> The optional <code>weight</code> element is the overall I/O
weight of the guest. The value should be in the range [100,
@@ -761,7 +762,8 @@
mandatory sub-elements, <code>path</code> describing the
absolute path of the device, and <code>weight</code> giving
the relative weight of that device, in the range [100,
- 1000]. <span class="since">Since 0.9.8</span></dd>
+ 1000]. The setting up device.weight will fail if the I/O elevator
+ of this disk device is not cfq. <span class="since">Since 0.9.8</span></dd>
</dl>
--
1.8.1.4
--
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