Re: [Xen-users] how can I enable multiple vcpus?

[Big Strong <fangtuo90@xxxxxxxxx>]

This is the full logs during booting. http://paste.ubuntu.com/13786410/

I hope that can helps

2015-12-07 15:42 GMT+08:00 Big Strong <fangtuo90@xxxxxxxxx>:

I think you can refer toÂhttp://wiki.xenproject.org/wiki/Tuning_Xen_for_Performance#Dom0_vCPUs for why I need to assign vcpus to dom0.I did as the wiki tells, the only difference is that my additional vcpu states are pause instead of running, which I can't explain.

Name                ÂID ÂVCPU  CPU State  Time(s) Affinity (Hard / Soft)
Domain-0 Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0 Â Â 0 Â Â0 Â r-- Â 14795.0 Â0 / all
Domain-0 Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0 Â Â 1 Â Â- ÂÂ--pÂÂ Â Â 0.0 Â1 / all
Domain-0 Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0 Â Â 2 Â Â- ÂÂ--pÂÂ Â Â 0.0 Â2 / all
Domain-0 Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0 Â Â 3 Â Â- ÂÂ--pÂÂ Â Â 0.0 Â3 / all

2015-12-07 15:32 GMT+08:00 TMC <tmciolek@xxxxxxxxx>:

Hi there

Why are you tryuing to allocate vcpus to dom0 ?

Also I am not sure that you can do VPCU's in dom0. Dom0 by default has access to all of the physical CPU's and controls allocation of vcpus to domU... you can give a Dom0 more/less CPUs but I have never seen any reference to vcpus for dom0... after all dom0 is the management domain for the xen hypervisor, and it is expected all the 'real work' will be done in domU's...

Tomasz

On 7 December 2015 at 14:17, Big Strong <fangtuo90@xxxxxxxxx> wrote:

I want to enable multiple vcpus to dom0, instead of domU. And I've configured 4 vcpus to dom0 and pinned it to physical cpu cores in EFI config files. But only one is truly available to dom0, the other three are in pause state as 'xl vcpu-list' shows.

Some added information.

~$ sudo xl info -n
host          : storage
release        Â: 3.13.0-24-generic
version        Â: #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014
machine        Â: x86_64
nr_cpus        Â: 6
max_cpu_id       : 143
nr_nodes        : 1
cores_per_socket    : 6
threads_per_core    : 1
cpu_mhz        Â: 1600
hw_caps        Â: bfebfbff:2c100800:00000000:00007f00:77fefbff:00000000:00000021:000037ab
virt_caps       Â: hvm hvm_directio
total_memory      : 32667
free_memory      Â: 21984
sharing_freed_memory  : 0
sharing_used_memory  Â: 0
outstanding_claims   : 0
free_cpus       Â: 0
cpu_topology      :
cpu:  Âcore  Âsocket   node
 0:    0    Â0    Â0
 1:    1    Â0    Â0
 2:    2    Â0    Â0
 3:    3    Â0    Â0
 4:    4    Â0    Â0
 5:    5    Â0    Â0
device topology    Â:
device      node
No device topology data available
numa_info       Â:
node:  Âmemsize  Âmemfree  Âdistances
 Â0:   34816   Â21984   Â10
xen_major       Â: 4
xen_minor       Â: 6
xen_extra       Â: .0
xen_version      Â: 4.6.0
xen_caps        : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler     Â: credit
xen_pagesize      : 4096
platform_params    Â: virt_start=0xffff800000000000
xen_changeset     Â:
xen_commandline    Â: console=vga,com1 com1=57600,8n1 loglvl=all noreboot dom0_mem=8g,max:8g dom0_max_vcpus=4 dom0_vcpus_pin ${xen_rm_opts} debug
cc_compiler      Â: gcc (Ubuntu/Linaro 4.7.3-12ubuntu1) 4.7.3
cc_compile_by     Â: root
cc_compile_domain   Â:
cc_compile_date    Â: Sun Dec Â6 11:51:01 CST 2015
xend_config_format   : 4

2015-12-06 14:45 GMT+08:00 fangtuo90 <fangtuo90@xxxxxx>:

I've configured 'dom0_max_vcpus=4 dom0_vcpus_pin' in bootloader.

However, 'xl list' shows only one vcpu is available to dom0

~$ sudo xl list

Name                    ÂID  Mem VCPUs   ÂState  Time(s)

Domain-0 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0 Â8191 Â Â 1 Â Â r----- Â Â 533.2

ubuntu-hvm                  1 Â2048   1   -b----   Â67.3

'xl vcpu-list' shows 3 of the 4 vcpus are paused, even though 'xentop' shows the cpu usage of dom0 is almost 100%

~$ sudo xl vcpu-list

Name                ÂID ÂVCPU  CPU State  Time(s) Affinity (Hard / Soft)

Domain-0 Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0 Â Â 0 Â Â0 Â r-- Â Â 533.6 Â0 / all

Domain-0               0   1  Â-  --p    0.0 Â1 / all

Domain-0               0   2  Â-  --p    0.0 Â2 / all

Domain-0               0   3  Â-  --p    0.0 Â3 / all

ubuntu-hvm              1   0  Â5  -b-   Â67.3 Âall / all

xentop - 14:42:29 Â Xen 4.6.0

2 domains: 1 running, 0 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown

Mem: 33451548k total, 10939112k used, 22512436k free  ÂCPUs: 6 @ 1600MHz

NAME ÂSTATE Â CPU(sec) CPU(%) Â Â MEM(k) MEM(%) ÂMAXMEM(k) MAXMEM(%) VCPUSÂ

Domain-0 -----r    1003  93.1  Â8388604  25.1  Â8388608   Â25.1   4 Â

ubuntu-hvm ------ Â Â Â 140 Â 9.6 Â Â2097452 Â Â6.3 Â Â2098176 Â Â Â 6.3 Â Â 1 ÂÂ

Any ideas on how to trully enable the vcpus?

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