Re: [Xen-users] Physical memory not fully available to DomU's

[JP P <storm66@xxxxxxxxxxxxxxxx>]

Le mardi 06 septembre 2011 Ã 08:51 +0200, Dennis Storm - Drecomm BV a
Ãcrit :
Hello,

If your machine is fitted with 96GB why are you using
(enable-dom0-ballooning yes) ?

If your DOM0 starts with 8GB put the same amount for "dom0_min_mem" and
ballooning = no.

I have had problems with "ballooning" ! So I am very cautious with its
usage.

Regards

JP P

> Hmm, just one reply of somebody who has the same issue. No one else
> encountered this problem? Or has any kind of clue?
> 
> Met vriendelijke groet,
> 
> Dennis Storm
> Senior Systeembeheerder
> 
> 
> 
> ______________________________________________________________________
> E d.storm@xxxxxxxxxx
> 
> T 050-577 58 22 (doorkiesnummer:
> 9701)
> 
> M 06 4141 0181
> 
> 
> drecomm
> 
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> ______________________________________________________________________
> 
> Op 2-9-2011 21:44, Dennis Storm schreef: 
> > Hi,
> > 
> > I'm having a weird problem with one of my Xen machines. I have a 96Gb 
> > ram server, running on Debian 6 with Xen kernel. However, I can only 
> > assign memory out of a pool of 24GB, the rest is unavailable for 
> > assignment. When trying to run a new DomU i'm getting the error that 
> > there isn't enough free ram. However, when I do the math myself I can 
> > see that there's 22GB of ram in use, which leave 74GB available (minus 
> > Dom0 minimum limit, which is set at 8GB).
> > 
> > I've tried disabling ballooning, i als saw posts of ram missing due to 
> > the balloondriver, but nothing in the likes of this volume of missing ram.
> > 
> > Any help would be very much appreciated. Seems a shame to let 74GB go to 
> > waste. If you need any more info, please let me know!
> > 
> > XM info output:
> > --------------
> > host                   : <blotted out>
> > release                : 2.6.32-5-xen-amd64
> > version                : #1 SMP Tue Jun 14 12:46:30 UTC 2011
> > machine                : x86_64
> > nr_cpus                : 16
> > nr_nodes               : 2
> > cores_per_socket       : 4
> > threads_per_core       : 2
> > cpu_mhz                : 2400
> > hw_caps                : 
> > bfebfbff:2c100800:00000000:00001f40:009ee3fd:00000000:00000001:00000000
> > virt_caps              : hvm
> > total_memory           : 98295
> > free_memory            : 19
> > node_to_cpu            : node0:0-3,8-11
> >                           node1:4-7,12-15
> > node_to_memory         : node0:19
> >                           node1:0
> > node_to_dma32_mem      : node0:0
> >                           node1:0
> > max_node_id            : 1
> > xen_major              : 4
> > xen_minor              : 0
> > xen_extra              : .1
> > 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
> > xen_commandline        : placeholder
> > cc_compiler            : gcc version 4.4.5 (Debian 4.4.5-10)
> > cc_compile_by          : waldi
> > cc_compile_domain      : debian.org
> > cc_compile_date        : Wed Jan 12 14:04:06 UTC 2011
> > xend_config_format     : 4
> > --------------
> > 
> > XM List output:
> > -----------
> > Name                                        ID   Mem VCPUs      State   
> > Time(s)
> > Domain-0                                     0 11257    16     r-----  
> > 24477.0
> > <hostname blotted out>                      25   256     8     -b----   
> > 4233.8
> > <hostname blotted out>                      11  1024     8     -b----   
> > 1725.5
> > <hostname blotted out>                       2  4192     8     r-----  
> > 66563.5
> > <hostname blotted out>                       3   512    16     -b----  
> > 15330.1
> > <hostname blotted out>                      17   512    16     -b----   
> > 5249.6
> > <hostname blotted out>                      18   512    16     -b----  
> > 12292.2
> > <hostname blotted out>                     19   512     1     -b----   
> > 6620.5
> > <hostname blotted out>                       8   512    16     -b----   
> > 1554.6
> > <hostname blotted out>                       9  1024     4     -b----   
> > 1837.1
> > <hostname blotted out>                      12  1024     4     -b----   
> > 5932.5
> > <hostname blotted out>                      13  1024    16     -b----  
> > 35491.3
> > <hostname blotted out>                      22  1024     8     -b----   
> > 5505.7
> > <hostname blotted out>                      20   512     1     -b----  
> > 15667.6
> > <hostname blotted out>                      23  2816     8     -b----   
> > 6621.9
> > <hostname blotted out>                      26   512     1     -b----  
> > 11633.6
> > <hostname blotted out>                      28   512    16     -b----    
> > 906.9
> > <hostname blotted out>                      15   512     1     -b----  
> > 17502.6
> > <hostname blotted out>                      27   256     1     -b----   
> > 3924.0
> > <hostname blotted out>                       7   512     1     -b----  
> > 12216.5
> > <hostname blotted out>                       6   512     1     -b----   
> > 9732.1
> > <hostname blotted out>                      29  2048    16     -b----   
> > 1738.4
> > <hostname blotted out>                       4   256     8     -b----   
> > 4346.0
> > <hostname blotted out>                      30  2048     8     -b----   
> > 4066.8
> > 
> > Total ram used for all DomU's: 22624MB
> > ----------------------
> > 
> > Config for DomU (generic for all running DomU's, except ram and core 
> > assignments)
> > ----------------------
> > 
> > #
> > #  Kernel + memory size
> > #
> > kernel  = '/boot/vmlinuz-2.6.32-5-xen-amd64'
> > ramdisk = '/boot/initrd.img-2.6.32-5-xen-amd64'
> > (enable-dom0-ballooning yes)
> > memory  = '2048'
> > vcpus   =  '8'
> > extra = 'xencons=tty'
> > 
> > #
> > #  Disk 
> > device(s).http://www.virtuatopia.com/index.php/Installing_and_Running_Windows_7_as_a_Xen_HVM_domainU_Guest
> > #
> > root    = '/dev/xvda1 ro'
> > disk    = [ 'file:/storage/target/disk.img,xvda,w', 
> > 'file:/storage/target/swap.img,xvdb,w' ]
> > 
> > #
> > #  Hostname
> > #
> > name    = '<hostname blotted out>'
> > 
> > #
> > #  Networking
> > #
> > vif  = [ 'ip=<obscured>' ]
> > 
> > #
> > #  Behaviour
> > #
> > on_poweroff = 'destroy'
> > on_reboot   = 'restart'
> > on_crash    = 'restart'
> > 
> > --------
> > 
> > xend-config.sxp
> > --------
> > (network-script network-bridge)
> > (vif-script vif-bridge)
> > (dom0-min-mem 196)
> > (enable-dom0-ballooning yes)
> > (total_available_memory 0)
> > (dom0-cpus 0)
> > ----------
> > 
> > Kind regards,
> > 
> > Dennis Storm - Drecomm BV
> > 
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> _______________________________________________
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> http://lists.xensource.com/xen-users





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