9. Patch: More Stability for Raspberry Pi
nano /boot/cmdline.txt
add the parameter
slub_debug=FP
( no new line! )
press Ctrl + o , Return, Ctrl + x to save changes
Manfred slub_debug is a bad idea. It will slow down your hashrate by 20%. I've tried it

. you should switch to BFGMiner.
I have never heard anyone else having a slowdown from this command. I have always gotten around ~360kh per miner at 850mhz with or without slub_debug.