From: Christoph Egger <Christoph.Egger@amd.com>
To: xen-devel@lists.xensource.com
Cc: William Pitcock <nenolod@dereferenced.org>
Subject: Re: [PATCH] tools/python/xend: VBD QoS policy bits
Date: Fri, 14 Aug 2009 17:19:22 +0200 [thread overview]
Message-ID: <200908141719.22764.Christoph.Egger@amd.com> (raw)
In-Reply-To: <20090814150428.20205CE13C@carpathia.dereferenced.org>
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@dereferenced.org>
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next prev parent reply other threads:[~2009-08-14 15:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-14 15:04 [PATCH] tools/python/xend: VBD QoS policy bits William Pitcock
2009-08-14 15:19 ` Christoph Egger [this message]
2009-08-14 16:21 ` William Pitcock
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