I think it should too, but I ended up doing this to achieve what I needed. ( only 1 vcpu for dom0)

- Padma

-

Padma,

Shouldn't the xm vcpu-set work regardless of the dom0-cpus value?

Raj

From: Apparao, Padmashree K [mailto:padmashree.k.apparao@xxxxxxxxx]
Sent: Thursday, June 08, 2006 5:03 PM
To: Carb, Brian A; xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: McAfee, Tommie M; Krysan, Susan; Puthiyaparambil, Aravindh; Subrahmanian, Raj; Vessey, Bruce A
Subject: RE: [Xen-devel] Unable to set dom0 vcpu to 1

Set (dom-cpus=1) in etc/xen/xend-config.sxp.

-Padma

-

Running xen-unstable changeset 10269 on a Unisys ES7000/one, x86_64, 16 procs, 16 GB RAM under SLES 10 RC1.

At startup, dom0-cpus is set to 0 (the default) in the xend-config.sxp file, and dom0 uses all 16 cpus. 'xm top' shows 16 procs, 'xm list' shows dom0 using 16 cpus, and 'xm vcpu-list' shows 16 cpus assigned to dom0.

When we try to reduce the procs for dom0 to 1 using 'xm vcpu-set 0 1', the number of procs, as shown by /proc/cpuinfo, reduces to 9. 'xm list' shows dom0 using 9 procs, and 'xm vcpu-list' shows that procs 1-7 have been released, while procs 0 and 8 through 15 are still assigned. Nothing is shown on the serial port.

Can anyone shed some light on why the rest of the procs might not be released? Thanks.

The following is output from 'xm list' and 'xm vcpu-list':

m0075:~ # xm list
Name ID Mem(MiB) VCPUs State Time(s)
Domain-0 0 15912 16 r----- 849.3
m0075:~ # xm vcpu-list
Name ID VCPU CPU State Time(s) CPU Affinity
Domain-0 0 0 0 -b- 438.1 any cpu
Domain-0 0 1 1 -b- 4.0 any cpu
Domain-0 0 2 2 -b- 5.4 any cpu
Domain-0 0 3 3 -b- 4.5 any cpu
Domain-0 0 4 4 -b- 8.4 any cpu
Domain-0 0 5 5 -b- 6.1 any cpu
Domain-0 0 6 6 -b- 5.0 any cpu
Domain-0 0 7 7 -b- 4.5 any cpu
Domain-0 0 8 8 -b- 30.3 any cpu
Domain-0 0 9 9 -b- 14.6 any cpu
Domain-0 0 10 10 r-- 29.1 any cpu
Domain-0 0 11 11 -b- 15.1 any cpu
Domain-0 0 12 12 -b- 71.6 any cpu
Domain-0 0 13 13 -b- 177.0 any cpu
Domain-0 0 14 14 -b- 14.5 any cpu
Domain-0 0 15 15 -b- 21.9 any cpu

m0075:~ # xm vcpu-set 0 1
m0075:~ # xm list
Name ID Mem(MiB) VCPUs State Time(s)
Domain-0 0 15912 9 r----- 853.2
m0075:~ # xm vcpu-list
Name ID VCPU CPU State Time(s) CPU Affinity
Domain-0 0 0 0 -b- 439.3 any cpu
Domain-0 0 1 - --p 4.0 any cpu
Domain-0 0 2 - --p 5.6 any cpu
Domain-0 0 3 - --p 4.5 any cpu
Domain-0 0 4 - --p 8.4 any cpu
Domain-0 0 5 - --p 6.1 any cpu
Domain-0 0 6 - --p 5.0 any cpu
Domain-0 0 7 - --p 4.5 any cpu
Domain-0 0 8 8 -b- 30.3 any cpu
Domain-0 0 9 9 -b- 15.0 any cpu
Domain-0 0 10 10 r-- 29.3 any cpu
Domain-0 0 11 11 -b- 15.2 any cpu
Domain-0 0 12 12 -b- 72.7 any cpu
Domain-0 0 13 13 -b- 177.5 any cpu
Domain-0 0 14 14 -b- 14.5 any cpu
Domain-0 0 15 15 -b- 22.0 any cpu

brian carb
unisys corporation - malvern, pa
brian.carb@xxxxxxxxxx