After I access some really (hundreds of MB) large files in UML, my UML 
system and even the applications on the host get slower and slower.

I think this comes from the so-called Linux buffer cache.

Linux seems to use all free memory pages for buffering disk pages. This 
is a good idea in a normal Linux system, because if a process requests a 
lot of memory, the former buffer cache are available for that process 
immediateley.

However, when UML caches disk pages, the memory used for that purpose 
are allocated to the memory of the UML kernel process from the host's 
point of view and so they are no longer available on the host and can 
not be used for other processes on the host.

What's the best solution for that problem?

-- 
Manfred Härtel, DB3HM    mailto:manfred.haer...@rz-online.de
                          http://rz-home.de/mhaertel

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