Hi all,
I'm trying to tune some memory parameters in my dom0 and domUs, and got
stuck. I've been googling, but can't find something "straightforward" ;)
I have a dom0 with 2GB RAM, and have 5 domUs in it, using Xen 3.1.0 with
kernel 2.6.18, all installed through Debian packages.
My dom0 is launched with
xenhopt=dom0_mem=256MB
in grub's /boot/grub/menu.lst.
I've created all my domUs with the following memory parameters:
----
memory = '128'
maxmem = '1024'
shadow_memory = 8
----
My domUs have a swap partition, and I've setted the kernel's swappiness
to 0.
With this config, I understand that the domUs will be started with an
starting amount of 128 MB RAM, and they will grow the amount used
according to their needs and availability. Well. No. They begin swapping
:/
In one domU, that is using almost all the initial memory, when disabling
the swap and launching another process, the OOM killer start killing
processes.
I've read something about a "balloon driver" that should do the magic,
but it all refers to info prior to 2006. In a chat script someone said
that it is now handled with the "mem-set/mem-max" parameters. There was
also some other guy telling about /proc/xen/balloon, but couldn't find any
detailed info on that either.
By now, I'm suspicious that I've missunderstood the memory handling in
Xen :)
Can you tell me if xen dom0/domUs CAN really dynamically allocate memory
to the domUs on demand? If so, is there any documentation I can read to
config it properly? do I need to run any application in the domXs?
Any help, any lead, any clue, will be greatly appreciated :)))))
Thanks in advance
Javier, a.a.t.
--
"The Universe we observe has precisely the properties we should
expect if there is, at bottom, no design, no purpouse, no evil, no
good, nothing but blind, pitiless indiference."
(Richard Dawkins)
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