[Xen-users] SLOW I/O performance

[ÐÐÐÐÑÐÐÐÑ ÐÐÐÐÑÐÐÐÐ <militenko_aa@xxxxxxxxxxxx>]

We have host-machine running Debian 6 (kernel 2.6.32-5-xen-amd64 ) with Xen 4.0 on it

there is mdadm-raid 10 and LVM on top of it that are use by Xen virtual machine

On host system disk write speed test with dd shows 86,7 MB/s

On Xen we have virutual machine with Win2008R2

PV drivers are installed

So on this Win2008R2-system disk write speed test (performed with hdtune) shows 4 MB/s

And in short disk read perfomance comparing host to guest systems is reduced for about 10 times.

Can anybody please explain why disk write/read speed is reduced so much with Xen?

Installes Packages:Â

mdadm                3.1.4-1+8efb9d1+squeeze1

lvm2 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â2.02.66-5

libxenstore3.0 Â Â Â Â Â Â Â Â Â Â Â4.0.1-4

linux-image-2.6.32-5-xen-amd64 Â Â Â2.6.32-48squeeze3

xen-hypervisor-4.0-amd64 Â Â Â Â Â Â4.0.1-4

xen-linux-system-2.6-xen-amd64 Â Â Â2.6.32+29

xen-linux-system-2.6.32-5-xen-amd64 2.6.32-48squeeze3

xen-qemu-dm-4.0 Â Â Â Â Â Â Â Â Â Â 4.0.1-2

xen-tools              4.2-1

xen-utils-4.0 Â Â Â Â Â Â Â Â Â Â Â 4.0.1-4 Â Â Â Â Â Â Â Â Â Â

xen-utils-common          Â4.0.0-1.1

xenstore-utils           Â4.0.1-4

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E-mail: militenko_aa@xxxxxxxxxxxx

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