Re: [Xen-users] dom0 memory usage >1GB at startup (no domU's configured)

[peter_booth@xxxxxx]

I think there is probably more time wasted through investigation of  
apparent memory issues in OSes than any other performance issue.  
Frequently these are non-issues.
Here's what you should do:
1. Dedicate 512MB ram and a single VCPU to dom0
2. Restart and continue happily

Sent from my iPhone

On Apr 4, 2010, at 7:52 AM, stalks <xen-users@xxxxxxxxxxxxxxxxxx> wrote:

> On 04/04/2010 03:44, stalks wrote:
> > Dear list,
> >
> > I have a new install of Debian Squeeze.
> >
> > I have followed the hints from the ParaVirtOps wiki page to grab  
> > Jeremy's kernel sources from kernel.org and compiled a 2.6.31.x  
> > (and 2.6.33.x) kernel.
> > I have yet to install any significant software other than package  
> > "xen-hypervisor-3.4-amd64".
> > The machine is a Core i7 920 with 8GB RAM.
> >
> > If I boot the plain kernel (without xen-3.4.gz) I get ~65MB ram  
> > usage shown in free -m.
> > If I boot with full xen, bear in mind I have no domU's yet, I get  
> > the following:
> > > free -m
> >            total       used       free     shared    buffers      
> > cached
> > Mem:          7948       1412       6535          0           
> > 9        107
> > -/+ buffers/cache:       1295       6652
> > Swap:            0          0          0
> >
> > > xm info
> > host                   : oracle
> > release                : 2.6.33.2-amd64-xen
> > version                : #1 SMP Sun Apr 4 00:21:54 BST 2010
> > machine                : x86_64
> > nr_cpus                : 8
> > nr_nodes               : 1
> > cores_per_socket       : 4
> > threads_per_core       : 2
> > cpu_mhz                : 2660
> > hw_caps                : bfebfbff: 
> > 28100800:00000000:00000340:0098e3bd:00000000:00000001:00000000
> > virt_caps              : hvm
> > total_memory           : 8183
> > free_memory            : 2174
> > node_to_cpu            : node0:0-7
> > node_to_memory         : node0:2174
> > xen_major              : 3
> > xen_minor              : 4
> > xen_extra              :
> > xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0- 
> > x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64
> > xen_scheduler          : credit
> > xen_pagesize           : 4096
> > platform_params        : virt_start=0xffff800000000000
> > xen_changeset          : unavailable
> > cc_compiler            : gcc version 4.4.3 (Debian 4.4.3-2)
> > cc_compile_by          : waldi
> > cc_compile_domain      : debian.org
> > cc_compile_date        : Mon Mar  1 21:16:18 UTC 2010
> > xend_config_format     : 4
> >
> > > xm top
> >   xentop - 03:33:21   Xen 3.4
> >   1 domains: 1 running, 0 blocked, 0 paused, 0 crashed, 0 dying, 0  
> > shutdown
> >   Mem: 8379516k total, 6152576k used, 2226940k free    CPUs: 8 @  
> > 2660MHz
> > (free -m): Over 1GB used inside dom0 already?
> > (xm info): Only 2GB available for guests?
> > (xm top): Over 6GB used?
> >
> > The only processes running outside of bare minimum are xinetd,  
> > sendmail, mdadm and ssh.
> > I can stop xend and xendomains from starting, and I still have 1GB  
> > used at startup.
> > The same setup on a lesser spec'd machine is working fine with  
> > ~140Mb used at boot. I've spent a few hours on this and am at a loss.
> > Some info can be found at the following sources:
> >
> > http://www.nooblet.org/other/xen-users/lspci.txt
> > http://www.nooblet.org/other/xen-users/lspci-vv.txt
> > http://www.nooblet.org/other/xen-users/cpuinfo.txt
> > http://www.nooblet.org/other/xen-users/grub.txt
> > http://www.nooblet.org/other/xen-users/dmesg.txt
> > http://www.nooblet.org/other/xen-users/meminfo.txt
> > http://www.nooblet.org/other/xen-users/ps-awwux.txt
> >
> > Someone show me the light!
> >
> > Regards,
> > Steve.
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> I have just tried 4.0.0 rc9 (xen-unstable.hg) and 2.6.32.10 with the  
> same results.
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