Re: [Xen-users] Calculate free memory

[ditwal001 <ditwal001@xxxxxxxxx>]

hi,

xm top

thanks walter

On 10 Aug 2011, at 16:33, Muriel <mucawhite@xxxxxxxxx> wrote:

> Hi all,
> can be a stupid question, but there is a method to calculate the free
> memory in a system that counts also the memory reserved for the Dom0?
> I tried using xm info and free comand but there is something wrong.
> A simple example, host with 4 GB, kernel 2.6.32.39, xen 4.0.2,
> scientific linux 6:
> 
> --------------------------------------------
> xm info
> total_memory           : 4094
> free_memory            : 1046
> 
> free -m
> total       used       free     shared    buffers     cached
> 3456       1090       2365          0          8        127
> 
> So from "xm info" i have 3048 MB reserved, but 3456 are for dom0 (
> difference -408)
> ------------------------------------------
> 
> Now a system with 16GB, xen 4.1, centos 5:
> xm info:
> total_memory           : 16381
> free_memory            : 13633
> 
> free -m
> total       used       free     shared    buffers     cached
> 3072       2196        875          0        160        338
> 
> For xm info i have 2748 MB reserved, but 3072 are for dom0 (diff -324)
> If I set the dom0 memory but the difference between xm info data and
> free remain constant.
> ------------------------------------------
> 
> I have thought of memory reserved for the hypervisor, but then I tried
> with this configuration:
> host with 8GB, kernel 2.6.32.39, xen 4.0.2, scientific linux 6:
> xm info
> total_memory           : 8190
> free_memory            : 5006
> 
> free -m
> total       used       free     shared    buffers     cached
> 3072       2454        617          0        194        338
> 
> For xm info i have 3190 MB reserved, but 3072 are for dom0 (diff +112).
> ------------------------------------------
> 
> Someone can explain what happens?
> There is a simple and reliable way to get as much ram I have available for 
> domU?
> 
> Thanks,
> Muriel
> 
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