RE: [Xen-devel] HD throughput

To:	"Marcus Hardt" <marcus.hardt@xxxxxxxxxx>, "Xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	RE: [Xen-devel] HD throughput
From:	"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date:	Mon, 9 May 2005 20:10:51 +0100
Delivery-date:	Mon, 09 May 2005 19:10:27 +0000
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Thread-topic:	[Xen-devel] HD throughput

> I've made some dd throughput measurements of my xen 
> installation. My reference throughput is a dd on a partition 
> very close to where my xen images/partitions are. I've found 
> that the throughput of my image-backed xen instance is at 
> around 93% of my reference, while the throughput of my 
> partition-backed xen instance is at around 50%. 
> 
> Is there an explanation for this? I had expected it to be 
> vice versa just like the xen manual itself.

There's a block device performance fix that is queued in 2.0-testing
pending release of 2.0.6.

Ian

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RE: [Xen-devel] HD throughput