[Pacemaker] Resource Scheduler Parameters

[btinsley]

On Tue, Apr 7, 2009 at 6:13 AM, btinsley <btinsley at gmail.com> wrote:

> On Tue, Apr 7, 2009 at 4:44 AM, Andrew Beekhof <beekhof at gmail.com> wrote:
>
>> On Tue, Apr 7, 2009 at 11:39, Dejan Muhamedagic <dejanmm at fastmail.fm>
>> wrote:
>> > On Tue, Apr 07, 2009 at 08:07:27AM +0200, Andrew Beekhof wrote:
>> >> Nothing in pacemaker - but the lrmd could be doing something that may
>> >> be involved
>> >
>> > AFAIK, it doesn't.
>>
>> Ok, I was just thinking that its the one that ultimately spawns the
>> process... so anything it did would also be inherited by the client.
>>
>>  btinsley: Perhaps look at /proc/<pid>/sched for the lrmd and aisexec
>> processes.  That may give you an idea of where the settings are coming
>> from.
>>
>> >
>> >>
>> >> On Tue, Apr 7, 2009 at 02:21, btinsley <btinsley at gmail.com> wrote:
>> >> > This is a little early in investigation on my end, but is there
>> anything
>> >> > that Pacemaker... or potentially OpenAIS, does that would restrict a
>> cluster
>> >> > resource from setting the scheduler type and/or priority? I have been
>> >> > tinkering with KVM instances and there is a 100% repeatable
>> difference
>> >> > between how it behaves when Pacemaker starts the resource and when I
>> start
>> >> > it via the same OCF script on the command line (as the root user).
>> When it
>> >> > is started via Pacemaker, it seems to be unable to change its
>> scheduler and
>> >> > priority and eventually the whole system is brought to its knees and
>> all
>> >> > monitors get stuck in the "waiting on I/O" (D) state, which freaks
>> Pacemaker
>> >> > out...rightfully so ;-)
>> >> >
>> >> > Looking at /proc/<pid>/sched shows:
>> >> >
>> >> > ...
>> >> > policy???????????????????????????? :??????????????????? 0
>> >> > prio?????????????????????????????? :??????????????????? 0
>> >> > ...
>> >> >
>> >> > And invoking the resource from the command line shows:
>> >> >
>> >> > ...
>> >> > policy???????????????????????????? :??????????????????? 2
>> >> > prio?????????????????????????????? :??????????????????? 120
>> >> > ...
>> >> >
>> >> > Invoking ulimit with the -e and -r parameters with a value of
>> "unlimited" in
>> >> > the OCF script does no good. Thoughts?
>> >> >
>> >> >
>>
>
>
> Thanks! I will do that this morning and go from there.
>
>
>
OK, aisexec and all Pacemaker processes have policy 2 (SCHED_RR) and
priority 0. All cluster resources have the same values (I think I inverted
the policy lines in the paste above). I also looked at other non-clustered
processes on the system (syslog-ng, sshd, etc) and they all have policy 0
(SCHED_OTHER) and priority 120, which is what the KVM process appears to
need to function properly. I will post to the AIS list and see what they say
since it looks like tweaking the scheduler parameters begins there.
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