[CentOS] Re: Re: Not seeing all memory in CentOS 5.1 x86_64

Victor Padro vpadro at gmail.com
Wed Jun 11 17:45:58 UTC 2008


On Wed, Jun 11, 2008 at 12:31 PM, henry ritzlmayr <centos at rc0.at> wrote:

> Am Mittwoch, den 11.06.2008, 10:06 -0700 schrieb MHR:
> > On Wed, Jun 11, 2008 at 8:36 AM, Ruslan Sivak <russ at vshift.com> wrote:
> > >
> > > I guess it has something to do with the ballooning driver for Dom0.  It
> > > looks like I just tried to allocation too much memory to DomU and the
> box
> > > went down hard.  I think there's a setting in xen to the min amount of
> > > memory to go down to, but I'm not sure why Dom0 is using 600mb of RAM.
>  Is
> > > there a mini installation of CentOS that I can do that would use less
> RAM?
> > >  I've already unchecked all the boxes when installing CentOS. I would
> like
> > > Dom0 to be as small as possible, both due to RAM usage and from a
> security
> > > perspective.
> >
> > I've not familiarized myself with xen yet, but have you considered
> > VMware Server?  I haven't had any serious problems with it, and none
> > at all since v1.0.5 came out (1.0.6 is the current one).  Works
> > nicely, stays within its memory allocation, and top et al work as
> > you'd expect them to.
> >
> > HTH
> >
> > mhr
>
> I evaluated VMware Server myself (v1.0.3) and at that time, Disk I/O was
> pretty bad within a virtual machine. The only solution I found was XEN
> with paravirtualization. Has there been any progress on that with later
> releases?
>
> For example:
>
> dd if=/dev/md5 of=/dev/null bs=1M count=1000 on bare metal gave 272 MB/s
> same within VMware gave only 47,9 MB/s
>
> I know that dd is not a benchmark - but for measuring sequential reads
> within a system its fair enough for me.
>
> Henry
>
>
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Does anyone has tested Openvz?
I see many hosting providers using Openvz with CentOS, but haven't had the
time to tried out yet, I know it's not paravirtualization but maybe someone
has been able to use it sucessfully?
I have the same issue with RHEL 5.2, just showing 4Gigs of my 6Gigs box.

Cheers,
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