RE: [Xen-users] How to use VCPUs

["Ata E Husain Bohra" <aehusain@xxxxxxxxxxx>]

Dear Carsten, 

I have a tangential question to ask, I am trying to install cpufrequtils on
my Dom0 which is 2.6.21-7.fc7xen. The cpufrequtils 002 gets installed
properly but it does not work, giving error like "no active driver
supported", BUT by doing this I messed up networking on one of the Dom0's
completely. I am just curious to know if you had some issues similar to this
at any point or does this version of Xen. 

I am sorry for digressing your issue, but though of asking this question out
of curious events observed at my end!

Regards,
Ata

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Carsten Schiers
Sent: Friday, March 13, 2009 6:35 AM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] How to use VCPUs

Dear all,

currently, I run Xen on a AMD Dualcore CPU. I have

  Dom0 (clearly)
  DomU Firewall (Endian)
  DomU Fileserving (Samba)
  DomU Mail&Fax (Scalix, Hylafax)
  DomU Videostraming (Vdr) 
  DomU DMZ (web frontend, file sharing)
  DomU 64 Bit development
  DomU 32 Bit development

Dom0 uses clearly 2 VPCU, pinned (because of cpufreq mgmt).

I assigend only 2 VPCUs to the development machines.

Does this make sense?

Or does it make more sense to assign 2 VCPUs to all response critical DomUs,
too.

Or does it make more sense to assign 1 VCPU only to all DomUs, because we
are not
sure that a VPCU is a physical CPU and it could be that the 2 VCPUs of a
DomU uses
the same physical core, which wouldn't make much sense.

Or does it make more sense to dedicate (as it is pinned anyhow) one VPCU
(and thus
physical CPU) to all machines that don't need much response time and save
one VCPU
for e.g. the Videostreaming DomU.

I am bit lost, not a lot of docs found so far...

Thanks and have a nice weekend,
Carsten.

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