Re: [Xen-users] Memory problems persist... Cannot allocate memory

[Moi même <storm66@xxxxxxxxxxxxxxxx>]

Le samedi 23 janvier 2010 Ã 21:17 -0500, James Pifer a Ãcrit :
> On Sat, 2010-01-23 at 23:02 +0100, jpp@xxxxxxxxxxxxxxxxxx wrote:
> > Hello,
> > 
> > What is the output of "xm top" and the memory size for the crashing
> > domU ?
> > 
> > Regards
> > 
> > JP Pozzi
> > 
> 
> xentop - 19:14:32   Xen 3.4.1_19718_04-26.
> 9 domains: 1 running, 8 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
> Mem: 33543988k total, 17741584k used, 15802404k free    CPUs: 16 @ 2533MHz
>       NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%) 
> VCPUS NETS NETTX(k) NETRX(k) VBDS   VBD_OO   VBD_RD   VBD_WR SSID
>   Domain-0 -----r    1246289  109.5    2095616    6.2   no limit       n/a    
> 16    0        0        0    0        0        0        0    0
> servercwi0 --b---      75887    1.5    1052588    3.1    1052672       3.1    
>  2    1        0        0    2        0        0        0    0
> serverhpd0 --b---     221480    0.0    4194304   12.5    4194304      12.5    
>  4    1 180634125 732323572    1        0    42849   778081    0
> servernoc0 --b---       4407    0.0    3145728    9.4    3145728       9.4    
>  4    1    33771  1808661    1        7    29602   912013    0
> serverpam2 --b---     237517    2.8    1052588    3.1    1052672       3.1    
>  2    1        0        0    1        0        0        0    0
> serverrly0 --b---     169632    0.5    4194304   12.5    4194304      12.5    
>  4    1 122085682 105533360    1        0   306821  1716024    0
> servervre0 --b---      32635    1.3     528300    1.6     528384       1.6    
>  1    1   535378 13214394    2       28   190040  1548933    0
> servervre0 --b---      39299    1.0     528300    1.6     528384       1.6    
>  1    1   890550 12268039    2      290  1143690  3083914    0
> servervre0 --b---      17685    1.4     528300    1.6     528384       1.6    
>  1    1  1182612  4006256    2        0  1520182  5525180    0
> 
> 
> By crashing I assume you mean the cannot allocate memory? Only 1024meg.
> 
> Thanks,
> James
> 

Hello,

I see that your Dom0 has 33543988k #32GB, is it all the memory in the
server?
If so it is possible that after some "ballooning" and memory allocation
the memory is too unorganized that the allocator can't find suitable
chunks of memory. I had had that problem after a system upgrade where
the "menu.lst" (or grub.fcg) was recreated without the tuning
parameters.
I think that 32GB is fa too much for the Dom0, usually Dom0 is limited
to a value between 1024M and 3072M with the dom0_mem=xxxx in the
grub.cfg, the memory of Dom0 is mainly used for buffer cache on behalf
of the Domus. 
It is also often useful to use the parameter "dom0_min_mem=xxx" in the
xend.config file. In my systems I use the same value eg : 
(dom0-min-mem 2048)  
(enable-dom0-ballooning no)   
in xend-config.sxo
and
 multiboot       /xen-3.4.gz /xen-3.4.gz noreboot dom0_mem=2048M 
in grub.cfg.
I have had problems with "ballonning yes" if domUs are stopped and
started many times without a server reboot (memory fargmentation ?).

Regards

JP Pozzi






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