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Bug: xentop Domain-0 output CPU(sec) and CPU(%) sometimes too high
Dear Xen users,

I use munin to monitor xen servers and munin uses xentop command to gather
information:

$ xentop -b -f -i2

In rare cases the output of this command gives too high (it seems buggy)
values for CPU(sec) and CPU(%), this destroys the munin graphs.

I tested this command from cli. After 50.000 cycle of run i got 72 case of
too high value.

Example normal values:
NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%) MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS VBD_OO VBD_RD VBD_WR VBD_RSECT VBD_WSECT SSID
Domain-0 -----r 21836089 0.0 3976448 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 21836095 171.0 3976448 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 21836097 0.0 3976448 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 21836102 173.0 3976448 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 21836104 0.0 3976448 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0

Example high values:
NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%) MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS VBD_OO VBD_RD VBD_WR VBD_RSECT VBD_WSECT SSID
Domain-0 -----r 9245189809 298754082186.3 3975384 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 9245193126 298571589937.4 3975384 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 9245195656 0.0 3975384 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 9245199096 0.0 3975384 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 9245202319 295762713155.5 3976448 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0

Is this a bug?


Neszt Tibor
E-mail: tibor@neszt.hu
PGP: 0xD4CC8D9F
Fingerprint = B005 B009 E093 25D4 B9E5 F3E8 C477 8F5B D4CC 8D9F

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Bug: xentop Domain-0 output CPU(sec) and CPU(%) sometimes too high [ In reply to ]
Dear Xen users,

I use munin to monitor xen servers and the munin uses xentop command to
gather information:

$ xentop -b -f -i2

In rare cases the output of this command gives too high (it seems buggy)
values for CPU(sec) and CPU(%), this destroys the munin graphs.

I tested this command from cli. After 50.000 cycle of run i got 72 case of
too high value.

Example normal values:
NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%) MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS VBD_OO VBD_RD VBD_WR VBD_RSECT VBD_WSECT SSID
Domain-0 -----r 21836089 0.0 3976448 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 21836095 171.0 3976448 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 21836097 0.0 3976448 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 21836102 173.0 3976448 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 21836104 0.0 3976448 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0

Example high values:
NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%) MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS VBD_OO VBD_RD VBD_WR VBD_RSECT VBD_WSECT SSID
Domain-0 -----r 9245189809 298754082186.3 3975384 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 9245193126 298571589937.4 3975384 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 9245195656 0.0 3975384 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 9245199096 0.0 3975384 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0
Domain-0 -----r 9245202319 295762713155.5 3976448 2.0 4194304 2.1 12 0 0 0 0 0 0 0 0 0 0

Is this a bug?


Neszt Tibor
E-mail: tibor@neszt.hu
PGP: 0xD4CC8D9F
Fingerprint = B005 B009 E093 25D4 B9E5 F3E8 C477 8F5B D4CC 8D9F

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Re: Bug: xentop Domain-0 output CPU(sec) and CPU(%) sometimes too high [ In reply to ]
On 17.04.2019 10:39, Neszt Tibor wrote:
> I use munin to monitor xen servers and munin uses xentop command to
> gather information:
>
> $ xentop -b -f -i2
>
> In rare cases the output of this command gives too high (it seems buggy)
> values for CPU(sec) and CPU(%), this destroys the munin graphs.
Hi,

We are experiencing the same issue with XEN 4.8 from Debian 9. What is
your XEN version?

--
Damian Pietras

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Re: Bug: xentop Domain-0 output CPU(sec) and CPU(%) sometimes too high [ In reply to ]
Hi,

I also use Debian 9 and XEN 4.8.

# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 9.5 (stretch)
Release: 9.5
Codename: stretch

# dpkg -l | grep xen
ii grub-xen-bin 2.02~beta3-5 amd64 GRand Unified Bootloader, version 2 (Xen binaries)
ii grub-xen-host 2.02~beta3-5 amd64 GRand Unified Bootloader, version 2 (Xen host version)
ii libxen-4.8:amd64 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64 Public libs for Xen
ii libxenstore3.0:amd64 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64 Xenstore communications library for Xen
ii xen-hypervisor-4.8-amd64 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64 Xen Hypervisor on AMD64
ii xen-linux-system-amd64 4.9+80+deb9u6 amd64 Xen system with Linux for 64-bit PCs (dummy package)
ii xen-system-amd64 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64 Xen System on AMD64 (meta-package)
ii xen-utils-4.8 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64 XEN administrative tools
ii xen-utils-common 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 all Xen administrative tools - common files
ii xenstore-utils 4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10 amd64 Xenstore command line utilities for Xen


Neszt Tibor
E-mail: tibor@neszt.hu
PGP: 0xD4CC8D9F
Fingerprint = B005 B009 E093 25D4 B9E5 F3E8 C477 8F5B D4CC 8D9F

On Wed, 17 Apr 2019, Damian Pietras wrote:

> On 17.04.2019 10:39, Neszt Tibor wrote:
>> I use munin to monitor xen servers and munin uses xentop command to
>> gather information:
>>
>> $ xentop -b -f -i2
>>
>> In rare cases the output of this command gives too high (it seems buggy)
>> values for CPU(sec) and CPU(%), this destroys the munin graphs.
> Hi,
>
> We are experiencing the same issue with XEN 4.8 from Debian 9. What is
> your XEN version?
>
> --
> Damian Pietras
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xenproject.org
> https://lists.xenproject.org/mailman/listinfo/xen-users

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