Xen users - Apr 2009 - High CPU utilization on converted domU''s

I have a few domU''s that have been converted from standalone servers.
They are Windows 2000 servers. They run fine except for the CPU
utilization in xen. virt-manager shows 100% cou for the domU even though
inside the domU the CPU is 99% idle  according to Windows Task Manager. 

These domUs are running off image files. Any suggestions or settings I
should try?

xen version is xen-3.2.0_16718_18-0.3 on SLES10SP2 x64.

Current settings for on eof the domUs:
(domain
    (on_crash destroy)
    (uuid c1d60ccf-039d-2542-f122-c794ad109da5)
    (bootloader_args )
    (vcpus 2)
    (name server10)
    (on_poweroff destroy)
    (on_reboot restart)
    (bootloader )
    (maxmem 1024)
    (memory 1024)
    (shadow_memory 10)
    (features )
    (on_xend_start ignore)
    (on_xend_stop ignore)
    (start_time 1240234698.59)
    (cpu_time 2550.29315031)
    (online_vcpus 2)
    (image
        (hvm
            (kernel /usr/lib/xen/boot/hvmloader)
            (hpet 0)
            (boot c)
            (rtc_timeoffset -18001)
            (pae 1)
            (acpi 1)
            (localtime 1)
            (timer_mode 0)
            (apic 1)
            (device_model /usr/lib/xen/bin/qemu-dm)
            (usb 1)
            (notes (SUSPEND_CANCEL 1))
        )
    )
    (status 0)
    (store_mfn 262142)
    (device
        (vif
            (bridge eth1)
            (mac 00:50:8B:6F:CE:E2)
            (check_netware_disk 0)
            (devid 0)
            (uuid 6114d7eb-c4d5-2644-16b6-20afe9e5905d)
        )
    )
    (device
        (vbd
            (uuid a55744cc-8135-131f-5f43-a558ec50b138)
            (bootable 1)
            (devid 768)
            (driver paravirtualised)
            (dev hda:disk)
            (uname file:/var/lib/xen/images/server10/disk0)
            (mode w)
            (check_netware_disk 0)
        )
    )
    (device
        (vkbd
            (devid 0)
            (check_netware_disk 0)
            (uuid c80eb939-d4ea-ca73-bf29-8446aa1ba6a6)
        )
    )
    (device
        (vfb
            (vncunused 1)
            (uuid 126e0ec9-f5bd-888e-c94b-3364deb50f18)
            (devid 0)
            (location localhost:5905)
            (check_netware_disk 0)
            (type vnc)
        )
    )
    (device
        (console
            (protocol vt100)
            (uuid e6273d6a-b929-9509-c9f9-e15353fad97a)
            (location 4)
        )
    )
)

Thanks,
James


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On Thu, Apr 23, 2009 at 10:47 PM, James Pifer <jep@obrien-pifer.com>
wrote:
> I have a few domU''s that have been converted from standalone
servers.
> They are Windows 2000 servers.
How do you convert them? In general I find it easier to simply install
from stratch.
> They run fine except for the CPU
> utilization in xen. virt-manager shows 100% cou for the domU even though
> inside the domU the CPU is 99% idle  according to Windows Task Manager.
>
> These domUs are running off image files. Any suggestions or settings I
> should try?
>    (online_vcpus 2)
>            (pae 1)
>            (acpi 1)
>            (apic 1)
If I remember correctly, using standard PC HAL with 1 CPU usually
leads to better performance compared to ACPI HAL. Changing HAL is
somewhat tricky though, so I''d suggest you try a fresh install first
with cpus=1, pae=0, acpi=0, apic=0. If that works then you can modify
your current domU.

As a side note, I don''t know of any Windows PV driver for Windows
2000, so I/O performance (both network and disk) would be somewhat
dissappointing on that OS. Depending on your needs, that might or
might not be acceptable.
For higher I/O performance, you might want to try :
- using Windows 2003, plus GPLPV, or
- upgrade to Xen 3.3, and see if stubdom can help.

Regards,

Fajar

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