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I noticed, that flashcache_create reports that my computer has 0MB main memory.
flashcache_create uses sysinfo.totalram to get the amount of RAM in bytes a machine has.
Regarding to 'man 2 sysinfo' this value is given as multiplies of sysinfo.mem_unit.
Of course this is just a minor problem and just leads to a warning message, when creating a new flashcache device.