[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Xen-users] SLOW I/O performance

  • To: xen-users@xxxxxxxxxxxxx
  • From: ÐÐÐÐÑÐÐÐÑ ÐÐÐÐÑÐÐÐÐ <militenko_aa@xxxxxxxxxxxx>
  • Date: Thu, 24 Jul 2014 22:18:31 +0400
  • Delivery-date: Thu, 24 Jul 2014 18:19:43 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

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

ÐÐÐ.: +7 (812) 318-02-45

Xen-users mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.