Re: [Xen-users] cpu pinning not working correctly in xen-4.2 unstable

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Fri, Jun 22, 2012 at 10:37 AM, Dieter Bloms <xensource.com@xxxxxxxx> wrote:
> Hi,
>
> I'm running xen 4.2 unstable (last commit 
> e605d60923bf128dab6bd567d9fde54d001b0c24)
> and try to do some cpu pining.

Hey Deiter, did you mean to post this to xen-devel instead?

>
> But my domUs changed the cpus from time to time like:
>
> --snip--
> xen:~# xl vcpu-list
> Name                                ID  VCPU   CPU State   Time(s) CPU 
> Affinity
> Domain-0                             0     0    0   -b-    2833.2  any cpu
> Domain-0                             0     1    1   r--    1772.3  any cpu
> gateway                              1     0    0   ---     421.6  0
> appserver                            2     0    1   -b-      57.7  0
> filer                                3     0    1   -b-    1819.5  0
> backup                               5     0    1   -b-    2082.5  0
> dvdconvert                           6     0    0   ---    3546.1  any cpu
> dvdconvert                           6     1    0   ---    3320.6  any cpu
> vdrserver                            7     0    0   -b-      14.7  1
> --snip--
>
> I've pinned vdrserver to cpu 1 and it runs an cpu 0 for example.
>
> Is this a bug, or did I something wrong ?
>
> Btw: I use the credit2 scheduler, because it is better for my dvb 
> broadcasting stuff.

Glad to know it works well for you -- that's exactly the kind of
workload it's aimed at.  Unfortunately it's still experimental:
pinning is not implemented yet in credit2.  You should be able to
implement something similar using cpupools.  There's a blog post on
that here: http://blog.xen.org/index.php/2012/04/23/xen-4-2-cpupools/

Another feature introduced in 4.2 is the ability to set credit1's
credit timeslice.  The default is still 30ms, which is *far* too long
for real-time; you might try setting it to something between 1 and 5
and see if that works well enough for you.  There's a blog post on
that here: 
http://blog.xen.org/index.php/2012/04/10/xen-4-2-new-scheduler-parameters-2/

 -George

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