Re: [Xen-devel] Setting Xen scheduler parameters

[Ryan Harper <ryanh@xxxxxxxxxx>]

* pak333@xxxxxxxxxxx <pak333@xxxxxxxxxxx> [2006-06-08 10:38]:
> Hi all,
> 
> I am trying to experiment with xen schedulers. I am able to see the scheduler 
> parameters but unable to modify them. For example is I say
> 
> "xm sched-sedf" I get
> Name                      ID   Period(ms)    Slice(ms)    Lat(ms)      Extra  
>      Weight
> Domain-0                0      20.0             15.0            0.0           
>    1             0
> Guest1                    2     100.0               0.0             0.0       
>       1              0
> 
> When I do xm sched-sedf   2 200000 50000 0 0 0
> I get the same things as above
> Name                      ID   Period(ms)    Slice(ms)    Lat(ms)      Extra  
>      Weight
> Domain-0                0      20.0             15.0            0.0           
>    1             0
> Guest1                    2     100.0               0.0             0.0       
>       1              0
> 
> How do I change the schduling parameters? Cna someone let me know if I
> should be doing something else before changing the params

You need to specify which parameters you want to modify as listed in help for 
sched-sedf:

root@bebop:~ # xm help sched-sedf
   sched-sedf [DOM] [OPTIONS]       Show|Set simple EDF parameters
              -p, --period          Relative deadline(ms).
              -s, --slice           Worst-case execution time(ms)
                                    (slice < period).
              -l, --latency         scaled period(ms) in case the domain
                                    is doing heavy I/O.
              -e, --extra           flag (0/1) which controls whether the
                                    domain can run in extra-time
              -w, --weight          mutually exclusive with period/slice and
                                    specifies another way of setting a domain's
                                    cpu period/slice.

The command you want is probably:

xm sched-sedf <DOMID> -p 20.0 -s 5.0

root@bebop:~ # xm sched-sedf
Name                              ID Period(ms) Slice(ms) Lat(ms) Extra Weight
Domain-0                           0      20.0      15.0     0.0      1      0
debian_sarge_3                     1     100.0       0.0     0.0      1      0
root@bebop:~ # xm sched-sedf 1 -p 20.0 -s 5.0
root@bebop:~ # xm sched-sedf
Name                              ID Period(ms) Slice(ms) Lat(ms) Extra Weight
Domain-0                           0      20.0      15.0     0.0      1      0
debian_sarge_3                     1      20.0       5.0     0.0      1      0


Hope that helps.

-- 
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253   T/L: 678-9253
ryanh@xxxxxxxxxx

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