Re: [Xen-devel] Video Presentation on PCI Express x16 VGA Pass Through to Xen-based Windows XP Home Edition HVM Virtual Machine

["Mr. Teo En Ming (Zhang Enming)" <space.time.universe@xxxxxxxxx>]

Dear Konrad,

Please refer to my replies under your questions below.

Thank you.

-- 
Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
Blog URL: http://teo-en-ming-aka-zhang-enming.blogspot.com
Email: space.time.universe@xxxxxxxxx
MSN: teoenming@xxxxxxxxxxx
Mobile Phone: +65-9648-9798
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On Thu, Oct 8, 2009 at 9:59 PM, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:

On Thu, Oct 08, 2009 at 09:48:20PM +0800, Mr. Teo En Ming (Zhang Enming) wrote:
> Attached in this email are three JPEG screenshots showing disk I/O benchmark
> results for pvops dom0 kernels 2.6.30-rc3, 2.6.31-rc6, and 2.6.31.1.

Did you change the build-id of Xen between the tests? Meaning did you
check out a newer one between the releases?

No. I did not change the changesets of xen between the tests.
 

What is your underlaying disk for your guest?

I am not using a disk image file. I am using LVM2 logical volume for my Win XP Home guest.

Did you flush the cache before you ran the tests?
echo 3 > /proc/sys/vm/drop_caches

No I did not. I am not aware of this requirement.
 

Are you using stub-domain or normal QEMU?

I don't think I am using stub-domain. I should be using normal QEMU.
 

What is the xm entry for the disk in your .xm.

Here is my Win XP Home Edition domU guest configuration:

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

kernel = "/usr/lib/xen/boot/hvmloader"
builder='hvm'
memory = 3072

# Should be at least 2KB per MB of domain memory, plus a few MB per vcpu.
#shadow_memory = 8
name = "winxphome32"
vif = [ 'bridge=eth0' ]
acpi = 1
apic = 1
disk = [ 'phy:/dev/virtualmachines/winxphome32,hda,w', 'phy:/dev/sr0,hdc:cdrom,r' ]

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

#-----------------------------------------------------------------------------
# boot on floppy (a), hard disk (c) or CD-ROM (d)
# default: hard disk, cd-rom, floppy
boot="cd"
#sdl=0
#vnc=1
#vncconsole=1
#vncpasswd=''

#serial='pty'
#usbdevice='tablet'
# onboard
#pci = [ '00:02.0' ]
# nvidia & firewire
pci = [ '01:00.0','02:01.0' ]
vcpus=2
# No passthrough
#gfx_passthru=0
# onboard
#gfx_passthru=1
# nvidia
gfx_passthru=2

# Can only pass through one usb device at a time
usb=1
# USB Unity Green Mouse
#usbdevice = 'host:1bcf:0007'
# USB A1pro Black Mouse
usbdevice = 'host:15d9:0a41'
# USB Keyboard
#usbdevice = 'host:0603:00f2'
# USB Sony IC Recorder
#usbdevice = 'host:054c:0271'
# USB Lexmark X1270 Color Printer
#usbdevice = 'host:043d:00ff'
# USB Lexmark X1270 Photo Scanner
#usbdevice = 'host:043d:007d'
# USB Lexmark X1270 Generic Hub
#usbdevice = 'host:043d:007a'
 

Are you using GPLV/Novell VMDK/etc accelerated drivers under Windows?

No. I don't think so.
 

How many iterations of the disk I/O benchmark did you run? As in, are those
screenshots of the first run, or the average over a couple of them.

They are not averages. They are first runs.

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