Re: [Xen-users] Xen scheduler setup

["trilok nuwal" <tc.nuwal@xxxxxxxxx>]

I havent tried this, but there are two sheduler credit and sedf
scheduler for xen host and this would be common for all the domains. As
from xen documantion, boot time sched=credit or sedf is used to set the
scheduler for the xen hosts.

For this there are two commands to set and get the parameters of the
scheduler for individual domin depednding on the scheduler. Scheduler
cant be differnet for the different domains.

#xm  sched-credit
#xm  sched-sedf  

sched-credit         Get/set credit scheduler parameters.
 sched-sedf           Get/set EDF parameters.

# xm sched-credit
Name                             
ID Weight Cap
Domain-0                          
0    256    0
os218                             
7    256    0
# xm sched-sedf
Error: Xen is running with the credit scheduler
# xm sched-sedf --help
Usage: xm sched-sedf <Domain> [options]

Get/set EDF parameters.
  -p [MS], --period[=MS]         Relative deadline(ms)
  -s [MS], --slice[=MS]          Worst-case execution time(ms). (slice <
                                
period)
  -l [MS], --latency[=MS]        Scaled period (ms) when domain performs
                                
heavy I/O
  -e [FLAG], --extra[=FLAG]      Flag (0 or 1) controls if domain can run
                                
in extra time.
  -w [FLOAT], --weight[=FLOAT]   CPU Period/slice (do not set with
                                
--period/--slice)

# xm sched-credit --help
Usage: xm sched-credit [-d <Domain> [-w[=WEIGHT]|-c[=CAP]]]

Get/set credit scheduler parameters.
  -d DOMAIN, --domain=DOMAIN     Domain to modify
  -w WEIGHT, --weight=WEIGHT     Weight (int)
  -c CAP, --cap=CAP              Cap (int)


I dont think bvt scheduler is available in latest xen 3.0 ( Not sure ).
Hope this will be worthful to you.

Thanks,
-Trilok

On 5/17/07, Ashish Gupta <ashishgup@xxxxxxxxx> wrote:

Hi,

I have been trying to setup Xen scheduling but have some questions:
1. When do we exactly specify the scheduler to use ? At dom0 boot time (i.e. when the host boots) or when the domU is created with xm ?

2. Can we change the scheduler when a domU is already running ?

3. Can we change the existing scheduler parameters at runtime for domU or dom0 ?

4. How do we figure out which scheduler is currently being used ?

The answers are probably straightforward but I haven't found a tutorial or a guide that explains these points, esp 2,3, or 4.

I am trying to experiment with the bvt scheduler and tried passing sched=bvt at xm create time. But I can't figure out if its actually being used or how to change its parameters.
Any help is greatly appreciated.

thanks,
Ashish

--
http://www.cs.northwestern.edu/~agupta
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