Xen users - Oct 2007 - suspect cpu utilization level

Hi all, I''ve a linux dom0, a dom1 winxp sp2 (WinXP) and another winxp
sp2
with 2 vcpu (WinXP_02)
Dom2 uses all the dom0 idle: I mean this vm uses too much resources, it
seems something wrong in configuration.

This is strange because the other win xp uses very few resources

I''ll attach some useful output..

Suggestions?


(domain
    (domid 4)
    (on_crash restart)
    (uuid f1bff0c3-812d-71e9-52e2-e107c7cb4943)
    (bootloader_args )
    (vcpus 2)
    (name WinXP_02)
    (on_poweroff destroy)
    (on_reboot restart)
    (bootloader )
    (maxmem 1526)
    (memory 1526)
    (shadow_memory 14)
    (cpu_weight 256)
    (cpu_cap 0)
    (features )
    (on_xend_start ignore)
    (on_xend_stop ignore)
    (start_time 1191851529.85)
    (cpu_time 1146.68402986)
    (online_vcpus 2)
    (image
        (hvm
            (kernel /usr/lib/xen/boot/hvmloader)
            (boot c)
            (device_model /usr/lib/xen/bin/qemu-dm)
            (pae 1)
            (rtc_timeoffset 0)
            (usb 1)
            (notes (SUSPEND_CANCEL 1))
        )
    )
    (status 2)
    (state r-----)
    (store_mfn 390654)
    (device
        (vif
            (bridge eth0)
            (mac 00:16:3e:06:e4:1f)
            (script vif-bridge)
            (uuid 3d0cff4d-cc7c-6934-d0c0-eb34841fa994)
            (backend 0)
        )
    )
    (device
        (vbd
            (uname phy:/dev/VolGroup00/WinXP_02)
            (uuid dfdbdf2d-edaa-d78d-2579-1d39cb50754e)
            (mode w)
            (dev hda:disk)
            (backend 0)
            (bootable 1)
        )
    )
    (device (vkbd (backend 0)))
    (device
        (vfb
            (vncunused 1)
            (type vnc)
            (uuid f7c06dbe-e869-7f05-9f91-d8850bc0566d)
        )
    )
)


I changed the xen scheduler giving more weight to WinXP_02 but it
wasn''t
useful
[root@localhost ~]# xm sched-credit
Name                              ID Weight Cap
Domain-0                           0    256    0
WinXP                              5    256    0
WinXP_02                           4    512    0



[root@localhost ~]# xm vcpu-list
Name                              ID  VCPU   CPU State   Time(s) CPU
Affinity
Domain-0                           0     0     0   r--     822.8 any cpu
Domain-0                           0     1     0   ---     431.7 any cpu
WinXP                              5     0     0   -b-     139.1 any cpu
WinXP                              5     1     0   -b-     140.2 any cpu
WinXP_02                           4     0     0   ---     624.8 any cpu
WinXP_02                           4     1     1   r--     621.8 any cpu


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> Hi all, I''ve a linux dom0, a dom1 winxp sp2 (WinXP) and another
winxp sp2
> with 2 vcpu (WinXP_02)
> Dom2 uses all the dom0 idle: I mean this vm uses too much resources, it
> seems something wrong in configuration.
>
> This is strange because the other win xp uses very few resources
Are the guests completely identical?  It does seem strange that it''s
using
more resources if they''re the same.
> I''ll attach some useful output..
<snip>
> I changed the xen scheduler giving more weight to WinXP_02 but it
wasn''t
> useful
> [root@localhost ~]# xm sched-credit
> Name                              ID Weight Cap
> Domain-0                           0    256    0
> WinXP                              5    256    0
> WinXP_02                           4    512    0
Giving more weight to a domain will cause it to run more, not less.  So 
increasing the weight would be expected to increase its CPU utilisation (see 
http://wiki.xensource.com/xenwiki/CreditScheduler).
> [root@localhost ~]# xm vcpu-list
> Name                              ID  VCPU   CPU State   Time(s) CPU
> Affinity
> Domain-0                           0     0     0   r--     822.8 any cpu
> Domain-0                           0     1     0   ---     431.7 any cpu
> WinXP                              5     0     0   -b-     139.1 any cpu
> WinXP                              5     1     0   -b-     140.2 any cpu
> WinXP_02                           4     0     0   ---     624.8 any cpu
> WinXP_02                           4     1     1   r--     621.8 any cpu
It says both domain 5''s CPUs are blocked on IO, which suggests
they''re waiting
for IO and therefore can''t run.

It looks like domain 4 isn''t blocked on IO and so it''s
continuing to run.

By the way, it looks like you have two vcpus in dom0?  That''s not
usually
necessary; giving dom0 just one vcpu should still enable it to serve other 
domains well and will leave more CPU time for other uses.

Does that help you somewhat?  What are you expected / wanting to happen?

Cheers,
Mark

-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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