Re: [Xen-users] out of memory with xen

[Maarten Vanraes <maarten@xxxxx>]

well if that is so, how can i free the cache?

I've read that an Out Of Memory kernel event should try to free as much cache 
as possible...

Sincerely,

Maarten

Op woensdag 27 juni 2007 11:36, schreef Petersson, Mats:
> > -----Original Message-----
> > From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> > Maarten Vanraes
> > Sent: 27 June 2007 10:28
> > To: xen-users@xxxxxxxxxxxxxxxxxxx
> > Cc: Arie Goldfeld
> > Subject: Re: [Xen-users] out of memory with xen
> >
> > wont the caching require more memory anyway, and won't it
> > start to swap and
> > ultimately start to kill processes?
>
> No, because the caches are used from "free memory", so if you don't
> start out with much memory, the cache won't grow so large. Essentially,
> the principle is that if you have some memory that isn't being used for
> "anything", it can be used as cache.
>
> --
> Mats
>
> > Sincerely,
> >
> > Op woensdag 27 juni 2007 10:04, schreef Arie Goldfeld:
> > > You could use dom0_mem grub parameter to restrict the size
> >
> > of RAM dom0
> >
> > > occupies; it looks somethings like this:
> > >
> > > kernel /xen.gz dom0_mem=400000
> > >
> > > On 6/27/07, Maarten Vanraes <maarten@xxxxx> wrote:
> > > > our xen server has 8GB RAM.
> > > >
> > > > dom0 is not doing anything, but has cached about 4.9GB of
> >
> > the ram, which
> >
> > > > results in failure to create new hosts.
> > > >
> > > > i'm using file based storage, and i've read in the
> >
> > mailing list archive
> >
> > > > about
> > > > the problem being /dev/loop being used internally in xen.
> > > >
> > > > is there a way to flush this cache? is there already a fix for the
> > > > extreme caching of these devices?
> > > >
> > > > I see that lvm is a possible workaround, but i'd rather
> >
> > not do this right
> >
> > > > now.
> > > > Plus it is not so easy to convert 500GB into lvm...
> > > >
> > > > any solutions yet?
> > > >
> > > > Sincerely,
> > > > --
> > > > Maarten Vanraes
> > > > BA NV: IT & Security
> > > >
> > > > _______________________________________________
> > > > Xen-users mailing list
> > > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > > http://lists.xensource.com/xen-users
> >
> > --
> > Maarten Vanraes
> > BA NV: IT & Security
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
>
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-- 
Maarten Vanraes
BA NV: IT & Security

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