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Re: [libvirt] [PATCH 1/2] conf: Support for Block Device IO Limits



On Wed, Aug 29, 2012 at 05:48:30PM +0200, Viktor Mihajlovski wrote:
> Introducing a new iolimits element allowing to override certain
> properties of a guest block device like the physical and logical
> block size.
> This can be useful for platforms with 'non-standard' disk formats
> like S390 DASD with its 4K block size.
> 
> Signed-off-by: Viktor Mihajlovski <mihajlov linux vnet ibm com>
> ---
>  docs/formatdomain.html.in     |   18 +++++++++++++++
>  docs/schemas/domaincommon.rng |   17 ++++++++++++++
>  src/conf/domain_conf.c        |   49 +++++++++++++++++++++++++++++++++++++++++
>  src/conf/domain_conf.h        |    5 ++++
>  4 files changed, 89 insertions(+), 0 deletions(-)
> 
> diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
> index be8489a..db77cc4 100644
> --- a/docs/formatdomain.html.in
> +++ b/docs/formatdomain.html.in
> @@ -1264,6 +1264,7 @@
>        &lt;driver name='qemu' type='raw'/&gt;
>        &lt;source dev='/dev/sda'/&gt;
>        &lt;geometry cyls='16383' heads='16' secs='63' trans='lba'/&gt;
> +      &lt;iolimits logical_block_size='512' physical_block_size='4096'/&gt;

I don't think 'iolimits' is a very good name for this - it suggested
to me that it was doing I/o rate thottling/tuning.


Daniel
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