Xen users - Dec 2010 - HVM memory ballooning for 2.4 based DomU''s?

Hi,

most of my DomU''s are paravirtualized and I''m used to
specifying the
''intiial'' memory and ''maxmem'' so I can
easily increase memory when need be.

But I also have a couple of Linux 2.4 HVM''s where I''d like to
do the
same - however this doesn''t seem to work.
> memory = 512
> maxmem=4096
Both ''xm list and ''xm top'' show that this DomU should
only have 512MB of
memory:
> myhvm                             25   512     1     -b----     25.5
> myhvm -----r         15   45.1     528352    1.6     528384      
> 1.6     1    1        0        0    2        0        0       
> 0          0          0    0
However, the machine itself says it has ''almost'' 4GB of
memory:
> # free
>              total       used       free     shared    buffers     cached
> Mem:       3880264      68228    3812036          0       3636      38984
> -/+ buffers/cache:      25608    3854656
> Swap:       524280          0     524280
When I try ''xm mem-set myhvm 512'', the command
doesn''t complain, but it
also doesn''t change in my DomU.

When I remove the ''maxmem'' parameter form the config file, the
DomU gets
512MB of memory, that can''t be increased with ''xm
mem-set''...



What is needed in a Linux 2.4 HVM DomU to support on-the-fly memory
changes? Is this even possible?



   Danilo




-- 
Danilo Godec, sistemska podpora / system administration

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