Xen users - Jul 2011 - Kernel memory initialisation

Hi,

I have a small problem on small (128Mo) PV DomU : the kernel use too 
much memory.

By default if I start my DomU kernel (2.6.39.3) with "memory = 128" in
the xmdomain cfg, I obtain only 54MB of usable memory :

# head -n 1 /proc/meminfo
MemTotal:          54844 kB


While searching, I found that Xen (I guess) annouce 4GB of ram to the 
kernel, so in logs I have :

# grep Memory /var/log/kern.log | tail -n1
Jul 18 12:40:10 roy kernel: [    0.000000] Memory: 46492k/4202496k 
available (2894k kernel code, 4063680k absent, 92324k reserved, 1826k 
data, 444k init)




Then I add mem=128M in "extra" area of my xmdomain cfg, and now I have
a
descent amount of usable memory (119MB) :

# head -n 1 /proc/meminfo
MemTotal:         122708 kB

# grep Memory /var/log/kern.log | tail -n1
Jul 18 13:14:10 roy kernel: [    0.000000] Memory: 114356k/131072k 
available (2894k kernel code, 448k absent, 16268k reserved, 1826k data, 
444k init)



But adding this parameter is not a "good" solution for me, so : is
there
a way to adjust the ratio of memory between the current memory usage and 
the amount of memory announced to the kernel ? (I only use 64bits systems)

Thanks,
Olivier

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