cloudstack-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Andrija Panic <andrija.pa...@gmail.com>
Subject Re: KVM Max Guests Limit
Date Fri, 09 Nov 2018 13:20:42 GMT
THx Wido, let me add this to agent.properties template on master, since
it's missing, I have no idea where you got it from (perhaps from code that
uses it)....

thx

On Fri, 9 Nov 2018 at 13:35, Wido den Hollander <wido@widodh.nl> wrote:

>
>
> On 11/9/18 1:33 PM, Andrija Panic wrote:
> > Thanks Wido - though I don't seem to be able to find any related setting
> > (there is host.overcommit.mem.mb but that is not it - unless you can
> > define negative value to it )  ?
> >
> https://github.com/apache/cloudstack/blob/master/agent/conf/agent.properties
> >
>
> host.reserved.mem.mb=32768
>
> That one should be the setting you might want to look at.
>
> In this case 32G is reserved and not available to CS.
>
> Wido
>
> >
> > thx
> >
> > On Fri, 9 Nov 2018 at 13:03, Wido den Hollander <wido@widodh.nl
> > <mailto:wido@widodh.nl>> wrote:
> >
> >
> >
> >     On 11/9/18 12:56 PM, Andrija Panic wrote:
> >     > afaik not - but I did run once or twice intom perhaps looselym
> >     connected
> >     > issue - ACS reports 100% of host RAM (makes sense) asavailable for
> VM
> >     > deployment to ACS - so in 1-2 cases I did run into out of memory
> >     killer,
> >     > crashing my VMs.
> >     >
> >     > It would be great to have some amount of "reserve RAM" for host OS
> >     - or
> >     > simply have PER HOST RAM disableTreshold setting, similar to
> >     cluster level
> >     > "cluster.memory.allocated.capacity.disablethreshold", just on host
> >     level...
> >     >
> >
> >
> >     You can do that already, in agent.properties you can set reserved
> >     memory.
> >
> >     But I doubt indeed that we need such a limit in ACS at all, why do we
> >     need to limit the amount of Instances on a hypervisor?
> >
> >     Or at least set it to a very high number by default.
> >
> >     Wido
> >
> >     > On Fri, 9 Nov 2018 at 12:03, Rafael Weingärtner
> >     <rafaelweingartner@gmail.com <mailto:rafaelweingartner@gmail.com>>
> >     > wrote:
> >     >
> >     >> Do we need these logical constraints in ACS at all?
> >     >>
> >     >> On Fri, Nov 9, 2018 at 6:57 AM Wido den Hollander <wido@widodh.nl
> >     <mailto:wido@widodh.nl>> wrote:
> >     >>
> >     >>>
> >     >>>
> >     >>> On 11/8/18 11:20 PM, Simon Weller wrote:
> >     >>>> I think these is legacy and a guess back in the day. It was
50
> >     at one
> >     >>> point and it was lifted higher a few releases. ago.
> >     >>>>
> >     >>>
> >     >>> I see. I'm about to do a test with a bunch of 128GB hypervisors
> and
> >     >>> spawning a lot of 128M VMs. Trying to see where the limit might
> >     be and
> >     >>> also stress the VR a bit by loading a lot of DHCP entries.
> >     >>>
> >     >>> Wido
> >     >>>
> >     >>>>
> >     >>>>
> >     >>>>
> >     >>>> ________________________________
> >     >>>> From: Ivan Kudryavtsev <kudryavtsev_ia@bw-sw.com
> >     <mailto:kudryavtsev_ia@bw-sw.com>>
> >     >>>> Sent: Thursday, November 8, 2018 3:58 PM
> >     >>>> To: dev
> >     >>>> Subject: Re: KVM Max Guests Limit
> >     >>>>
> >     >>>> Hi all, +1 for higher numbers.
> >     >>>>
> >     >>>> чт, 8 нояб. 2018 г. в 16:32, Wido den Hollander <wido@widodh.nl
> >     <mailto:wido@widodh.nl>>:
> >     >>>>
> >     >>>>> Hi,
> >     >>>>>
> >     >>>>> I see that for KVM we set the limit to 144 guests by default,
> can
> >     >>>>> anybody tell me why we have this limit set to 144?
> >     >>>>>
> >     >>>>> Searching a bit I found this:
> >     >>>>> https://access.redhat.com/articles/rhel-kvm-limits
> >     >>>>>
> >     >>>>> "This guest limit does not apply to Red Hat Enterprise
Linux
> with
> >     >>>>> Unlimited Guests. There is no guest limit for Red Hat
> Enterprise
> >     >>>>> Virtualization"
> >     >>>>>
> >     >>>>> There is always a limit somewhere, but why do we set it
to 144?
> >     >>>>>
> >     >>>>> I would personally vote for increasing this to 500 or
> something so
> >     >> that
> >     >>>>> users don't run into it that easily.
> >     >>>>>
> >     >>>>> Also, the log line is printed in DEBUG mode only when a
host
> >     reaches
> >     >>>>> this limit, so I created a PR to set this to INFO:
> >     >>>>> https://github.com/apache/cloudstack/pull/3013
> >     >>>>>
> >     >>>>> Any input?
> >     >>>>>
> >     >>>>> Wido
> >     >>>>>
> >     >>>>
> >     >>>>
> >     >>>> --
> >     >>>> With best regards, Ivan Kudryavtsev
> >     >>>> Bitworks LLC
> >     >>>> Cell RU: +7-923-414-1515
> >     >>>> Cell USA: +1-201-257-1512
> >     >>>> WWW: http://bitworks.software/ <http://bw-sw.com/>
> >     >>>>
> >     >>>
> >     >>
> >     >>
> >     >> --
> >     >> Rafael Weingärtner
> >     >>
> >     >
> >     >
> >
> >
> >
> > --
> >
> > Andrija Panić
>


-- 

Andrija Panić

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message