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xen-users
Re: [Xen-users] Xen scheduler setup
On 5/18/07, Ashish Gupta <ashishgup@xxxxxxxxx> wrote:
Thanks Trilok for the clarification !
On running some of your commands I get the following output. Does this
seem to indicate I am running the credit scheduler ? xm dmesg doesn't
tell me.
This is correct , be default xen use crdit scheduler
unless u explicitly use other scheduler. xm dmesg should
show the scheduler. It might be removed by the other messgaes in
xm dmesg buffer.
You can reboot the dom0 then just check the scheduler, probably u
will get that one in xm dmesg. What xen version u r using ?
I get the following output:
# xm sched-sedf
Name
ID Period(ms) Slice(ms) Lat(ms) Extra Weight
Domain-0
-1 -0.0
-0.0 -0.0
-1 -1
domain1
-1 -0.0
-0.0 -0.0
-1 -1
domain2
-1 -0.0
-0.0 -0.0
-1 -1
[root@virtuoso-32 sys]#
# xm sched-credit
Error: No domain given.
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)
# xm sched-credit -d 0
{'cap': 0, 'weight': 256}
On 5/17/07, trilok nuwal <tc.nuwal@xxxxxxxxx
> wrote:
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
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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http://www.cs.northwestern.edu/~agupta
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