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xen-users
Re: [Xen-users] priority of dom0?
>>>> when i compile something in dom0, my domUs are more then
>>>> unresponsible.
>>>> Any clue, what's going on? How can i change the "priority"
>> of dom0? I
>>>> think, that the CPU-time should be equally distributed
>>>> between the dom0
>>>> and the domUs.
>>> Whilst you can do this, the risk is that you get other
>> problems if you do that (like one DomU running away and Dom0
>> not getting a chance to run instead :-( which is slightly
>> worse, in case you would like to for example KILL that
>> DomU!)... You also want Dom0 to have a high priority (or to
>> be able to run for as long as it needs) to be able to
>> correctly and quickly respond to IO requests made on behalf
>> of DomU's. Unfortunately, this counteracts the Dom0 being low
>> priority...
>>
>> Well, i would expect some "fairness", that is:
>>
>> 50% dom0, 50% domU
>> or
>> 33% dom0 and 66% for two domUs
>> or
>> 25% dom0 and 75% for three domUs
>> and so on ...
>>
>> Perhaps, people would also like to say: guarantee up to 33%
>> percent CPU
>> usage to dom0. (Not meaning, that dom0 is limited to 33% and
>> not meaning
>> that all domUs together are limited to 66%)
>>
>> Don't you think, that this would be enough to ensure that IO
>> and network
>> is working properly?
>>
>> Of course, that requires a (fairly simple?) scheduler within Xen.
>
> That is what the credit scheduler is supposed to do... What version of Xen
> are you using?
>
> What does it say if you do "xm dmesg | grep -i sched"?
I am using Xen 3.0.2. I seem to be using the sedf scheduler. I didn't
change anything concerning the scheduling. I'm using the default.
Here is the state of my current configuration:
# xm dmesg|grep -i version
Xen version 3.0.2 (root@(none)) (gcc-Version 4.1.1 (Gentoo 4.1.1)) Fr
Okt 6 22:52:03 Local time zone must be set--see zic manual page 2006
# xm dmesg|grep -i sched
(XEN) Using scheduler: Simple EDF Scheduler (sedf)
# xm sched-sedf
Name ID Period(ms) Slice(ms) Lat(ms) Extra Weight
Domain-0 0 20.0 15.0 0.0 1 0
xen-sk1 3 100.0 0.0 0.0 1 0
xen-to1 2 100.0 0.0 0.0 1 0
I'm searching for documentation about the scheduler and their
parameters. I didn't find much.
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