Re: Slow disk IO on virtio kvm guests with Centos 5.5 as hypervisor

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On Tue, 15 Feb 2011 09:19:23 +0000, Stefan Hajnoczi
<stefanha@xxxxxxxxx> wrote:

> Did you run dd with O_DIRECT?
 
> dd if=/dev/zero of=<path-to-device> oflag=direct bs=64k

Using O_DIRECT, performance went down to 11 MB/s on the hypervisor...

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Thomas
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