RE: [Xen-users] Re: XEN ans Windows SMP

["Venefax" <venefax@xxxxxxxxx>]

I played with my vcpus=2 setting in the SXP file:
(domain
    (on_crash destroy)
    (uuid ab005354-d6d2-5bee-e0fc-f16849a2a1bc)
    (bootloader_args )
    (vcpus 2)
    (cpus 1-15)
    (name test1)
    (on_poweroff destroy)
    (on_reboot restart)
    (bootloader )
    (maxmem 1500)
    (memory 1500)
    (shadow_memory 32)
    (features )
    (on_xend_start ignore)
    (on_xend_stop ignore)
    (start_time 1227150800.97)
    (cpu_time 215.178103717)
    (online_vcpus 2)

My Machine definition file is 
name="test1"
uuid="ab005354-d6d2-5bee-e0fc-f16849a2a1bc"
memory=1500
maxmem=1500
vcpus=2
on_poweroff="destroy"
on_reboot="restart"
on_crash="destroy"
localtime=1

builder="hvm"
extid=0
device_model="/usr/lib/xen/bin/qemu-dm"
kernel="/usr/lib/xen/boot/hvmloader"
boot="c"
disk=[ 'file:/xen/test1/disk2,hda,w',
'file:/suse/en_win_srv_2003_r2_enterprise_with_sp2_cd1_X13-05460.iso,hdc:cdr
om,r', ]
vif=[ '', ]
stdvga=0
vnc=1
vncunused=1
apic=1
acpi=1
pae=1

usb=1
usbdevice='tablet'
I am using the GPLPV driver, latest version from 48 hours ago, pre-4.
Federico


-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Oliver Wilcock
Sent: Monday, November 24, 2008 11:12 AM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Re: XEN ans Windows SMP

> Date: Mon, 24 Nov 2008 08:01:35 -0500
> From: "Venefax" <venefax@xxxxxxxxx>
>
> There is an amazing problem between XEN and Windows 2003 SMP. For
> instance, a 1 CPU Windows VM takes 0.7 percent while running idle, but if
> you add a second CPU, still idle, the percentage shoots up to 3.6%. As a
> result, you can only have a few Windows SMP machines. Is there a solution
> to make the SMP simulation more efficient in XEN?
> Federico

By SMP so you mean you are using a non-ACPI HAL?  (perhaps acpi=0 in your
config?)  Or do you mean you played with the vcpus=2 setting?

CPU AMD 64?
64 bit hypervisor?
32 bit Windows?
Linux distribution and Xen version?

I'm trying to find out why my experience with a 64 bit hypervisor and 32
bit Windows gives such lousy performance (I've seen a few other people
mention it, but I believe most don't have the problem).

When using an ACPI Multiprocessor HAL I see idle CPU usage (xm top) closer
to 112% when vcpus=2 and the DomU guest VM is sluggish.  I'm using SLES 10
SP2 on AMD X2 with ASUS M2N-LR.  I plan to experiment with other CPUs and
kernels when I have a chance.



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