[Xen-users] Slow Disk access on SLES 10 install

I have been struggling with a problem for a couple of days and I hope someone
has some ideas.

I am using SLES 10 as a base for my Dom0 and I am trying to build a
paravirtualized guest domain.  

I have tried lots of combinations of things but the disk during the install
is increcdibly slow.  I am fairly certain that this is
something I have set wrong, as I see the same results on two very different
hardware platforms.  It takes about 2 hours for the first CD install; and
that time is the same if I use the cd drive as a source of my install or if
I use an NFS based source.


Below is my domain config file  --- I have tried lots of combinations of
things but still the same result.


--------------------------------------------------------------------------------------------------------------------------
disk = [ 'file:/var/lib/xen/images/basesles10/hda,hda,w' ]
memory = 348
vcpus = 1
builder = 'linux'
kernel = '/tmp/YaST2-04473-dmQhaD/vmlinuz-2.6.16.21-0.8-xen'
ramdisk = '/tmp/YaST2-04473-dmQhaD/inst-initrd'
name = 'basesles10'
ip = '192.168.1.253'
netmask = '255.255.255.0'
gateway = '192.168.1.1'
interface = 'eth0'
vif = [ 'mac=00:16:3e:d1:dc:36,bridge=xenbr0',
'mac=00:16:3e:e2:e6:a0,bridge=xenbr1' ]
localtime = 0
on_poweroff = 'destroy'
on_reboot = 'destroy'
on_crash = 'destroy'

import os, re
arch = os.uname()[4]
if re.search('64', arch):
    arch_libdir = 'lib64'
else:
    arch_libdir = 'lib'

device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm'


#----------------------------------------------------------------------------
# enable SDL library for graphics, default = 0
sdl=0

#----------------------------------------------------------------------------
# enable VNC library for graphics, default = 1
vnc=1

#----------------------------------------------------------------------------
# enable spawning vncviewer(only valid when vnc=1), default = 1
vncviewer=1

#----------------------------------------------------------------------------
# no graphics, use serial port
#nographic=0

#----------------------------------------------------------------------------
# enable stdvga, default = 0 (use cirrus logic device model)
stdvga=0

#-----------------------------------------------------------------------------
#   serial port re-direct to pty deivce, /dev/pts/n
#   then xm console or minicom can connect
serial='pty'

#----------------------------------------------------------------------------
# enable ne2000, default = 0(use pcnet)
ne2000=0


#-----------------------------------------------------------------------------
#   enable audio support
#audio=1


#-----------------------------------------------------------------------------
#    set the real time clock to local time [default=0 i.e. set to utc]
#localtime=1


#-----------------------------------------------------------------------------
#    start in full screen
#full-screen=1

extra = 'install=nfs://192.168.1.9//opt/software/SLES10/disk1 TERM=xterm
textmode=0 vnc=1 hostip=192.168.1.253 netmask=255.255.255.0 ide=nodma
gateway=192.168.1.1 netdevice=eth0'

------------------------------------------------------------------------------------------------------------------

The ide=nodma is a farily recent addtion;  it did not seem at have any
effect on things.

Oddly, I did not see this when I used full virtualization.  That
installation was very normal.  

I am positive that I need to set something slightly different - I just do
not know what it it.

Thanks for any suggestions.
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