[Barrelfish-users] Insight on Memory Management

[Daniel Röhrig]

Hey guys,

we are almost done porting barrelfish to our own arm board (portuxg20). 
Well at least virtually. We are still using our customized Qemu build 
for that. The Problem is, that we only have 128MB RAM. In Qemu we can 
double that amount to 256 without any problems but on our real hardware 
that is not so easy. What we would like to know is how much memory do we 
really need? If we give Qemu 256MB everything is fine. 257MB: Still 
fine. 255MB: Error! 128MB: Different error, but still completing the 
memory test. Can you give us some insight about how barrelfish allocates 
it's memory? And is it possible to run it with less than 256MB?

 From what we've seem, we can assume that whatever memory there is on 
the board, barrelfish takes 56MB for ... something, and then another 
64MB for ... something else. These values seem to be hardcoded but we 
don't know where. Any kind of help would be really appreciated.

Regards,
Daniel