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Re: [Xen-devel] [PATCH] tools/python/xend: VBD QoS policy bits

from [Christoph Egger]

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Subject:	Re: [Xen-devel] [PATCH] tools/python/xend: VBD QoS policy bits
From:	Christoph Egger <Christoph.Egger@xxxxxxx>
Date:	Fri, 14 Aug 2009 17:19:22 +0200
Cc:	William Pitcock <nenolod@xxxxxxxxxxxxxxxx>
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On Friday 14 August 2009 11:48:47 William Pitcock wrote:
> Add the ability to define VBD QoS policy in the xend layer.
>
> Consider the following vbd entry:
>
> vbd = [
>    'phy:/dev/server/virtualmachine1-disk,xvda1,w,credit=5000/s@50ms',
> ]
>
> This means that a VM may perform 5000 I/O operations per second, with
> credit being replenished every 50 milliseconds.

Does this enforce the VBD to do 5000 IO operations or none at all or is
this considered as an upper limit ?

> The 'credit' xenstore value is by the blkback driver to ratelimit I/O
> operations for the specific device.
>
> Signed-off-by: William Pitcock <nenolod@xxxxxxxxxxxxxxxx>




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