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Re: [Xen-users] HDD-performance on HVM winxp

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] HDD-performance on HVM winxp
From: Alexander Junghans <xen@xxxxxxxxxxxxx>
Date: Mon, 28 Apr 2008 22:21:17 +0200
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Hi,

Iometer have been installed from http://www.iometer.org/ under XP.
Transfer request size to 1MB and 128k and measured.

1MB:
Read: 35MB/s
Write: 10MB/s

128k:
Read: 21MB/s
Write: 7,5MB7s

I think that there is a problem with your setup.
My setup uses a LVM Volume on Software Raid1 on
two SATA Drives.

XEN 3.2.1build from Source.

But I have a problem with the load in dom0, when
XP ist idle.

The CPU in Xentop is nearly 100% all the time, in
the xp dom.

What is your cpu level of the HVM Domain.

Thanks.
Alexander Junghans


Daniel Schwager schrieb:
Hi together,

i'm running a winxp hvm-domain without the GPLPV-driver.

I imported an iscsi-target as a lun for the winxp-domain and
run an iometer test directly on the winxp-domain:

        Blocksize       type    MB/sec
        ------------------------------
        1 MB            read    25 MB
        1 MB            write   0.8 MB
        128 kb  read    25 MB
        128 kb  write   0.8 MB

If I run the same test on the xen-domain0 (hostsystem)using iometer's
dynamo, I got
        Blocksize       type    MB/sec
        ------------------------------
        1 MB            read    66 MB
        1 MB            write   55 MB

My problem ist the 0.8MB/sec in the winxp-domain...
Is there a way to track down the performance issue ?

[root@xen04 /var/log/xen]$ rpm -qa | grep xen
kernel-xen-devel-2.6.21-2957.fc8
kernel-xen-devel-2.6.21.7-3.fc8
xen-libs-3.1.2-2.fc8
kernel-xen-2.6.21.7-3.fc8
xen-3.1.2-2.fc8
xen-libs-3.1.2-2.fc8
kernel-xen-2.6.21-2957.fc8
kernel-xen-2.6-doc-2.6.21.7-3.fc8

[root@xen04 /var/log/xen]$ uname -a
Linux xen04.test 2.6.21-2957.fc8xen #1 SMP Tue Feb 12 13:07:27 EST 2008
x86_64 x86_64 x86_64 GNU/Linux


regards
Danny


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