Re: [Xen-users] Credit Scheduler

[Florian Schmaus <flo4lists@xxxxxxxxxx>]

Both domUs have 2 VCPUs:

Name                              ID VCPUs   CPU State   Time(s) CPU 
Affinity
Domain-0                        0     0             0   r--    1738.8 0
Domain-0                         0     1             1   -b-     532.0 1
web                                  6     0             1   r--  
422829.0 any cpu
web                                  6     1             0   ---  
422758.0 any cpu
boinc                               2     0             0   -b-    
5096.9 any cpu
boinc                               2     1             1   -b-     
928.2 any cpu
Florian

Dustin Henning wrote:
>         Just a wild guess, but do both domUs have single VCPUs with a
> different CPU assigned?  It seems reasonable to assume that the domUs would
> have to be using the same CPU(s) in order for the priority to come into
> play.  Assuming I am correct there, they should have the same CPU assigned
> if they are using one VCPU; if they are using two VCPUs then they should
> each be using both CPUs anyway, and in either of the aforementioned
> scenarios, the priority should come in to play.
>         Dustin
>
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Florian Schmaus
> Sent: Monday, December 01, 2008 10:24
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Credit Scheduler
>
> I have a CentOS 5.2 Dual-Core Host with two domU's. One domU is for 
> apache and postfix, the other one is just for BOINC. I thought that I 
> can configure the XEN credit scheduler in such a manner, that the BOINC 
> domU only gets CPU resources if the other one, the "important" one, has 
> nothing else to do.
> After a "xm sched-credit -d boinc -w 1" and "xm sched-credit -d web -w 
> 200" I run a CPU benchmark on the "web" domU. I expected that the "web" 
> domU would get 199% CPU share and the boinc domU just 1%, because the 
> "web" domU hast 200 times more weight than the BOINC domU. But the 
> credit scheduler gave both domU's about 100% CPU share.
> What am I missing here?
>
> xm dmesg shows "(XEN) Using scheduler: SMP Credit Scheduler (credit)"
> and "xm sched_credit -d web" also confirms that the weight is set correctly.
>
> Regards
>  Florian
>
>
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