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Re: [Xen-users] Difference performances between HVM and PV guest in har

To: xen-users list <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Difference performances between HVM and PV guest in hard disc reading
From: Heli <helicoterus-elih@xxxxxxxx>
Date: Mon, 25 May 2009 20:50:58 +0200
Delivery-date: Mon, 25 May 2009 11:51:32 -0700
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Fajar A. Nugraha ha scritto:
On Sun, May 24, 2009 at 7:25 PM,  <helicoterus-elih@xxxxxxxx> wrote:
I perform some tests to get hard disc performance differences between HVM domU 
and a paravirtualized one (both Debian Lenny).

first of all, make sure you do NOT use file:/ in domU config. At least
use tap:aio:

I used hdparm ( option -t and -T) to test cache of disc and disc sequential 
read.
Syntax is:
hdparm -t|-T /dev/hda1

hdparm -t for hvm returns about 30 MB/sec, wheras hdparm -t for PV return about 
180 MB/sec.

This is normal. HVM by default should have MUCH lower disk throughput.
That's why HVM domUs need PV drivers for both Linux (included by
default on RHEL/Centos 5.3, not available yet for newer kernels) and
Windows (like GPLPV).
Where I can find this drivers for debian?
I would like to test a debian HVM virtual machine with these "magic" drivers.
I only saw windows ones.

Thanks
Chiacchiera con i tuoi amici in tempo reale! http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com
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