Fix for kswapd0 making system unusable when io and memory usage is high

swapd_fix.conf

# On Arch Drop this file into /etc/sysctl.d/
# and run sysctl --system
# on other systems put in /etc/sysctl.conf
# http://discussions.citrix.com/topic/277290-kswapd0-process-consumes-a-guest-vm/#entry1511105                                                                                                                      
                                                                                                                                                                                                                    
vm.dirty_background_ratio = 3                                                                                                                                                                                       
# (default was 10, had tried 5))                                                                                                                                                                                    
vm.dirty_expire_centisecs = 500                                                                                                                                                                                     
# (default was 3000, had tried 1000)                                                                                                                                                                                
vm.dirty_ratio = 15                                                                                                                                                                                                 
# (default was 40)                                                                                                                                                                                                  
vm.dirty_writeback_centisecs = 100                                                                                                                                                                                  
# (default was 500){quote}                                                                                                                                                                                          
                                                                                                                                                                                                                    
# If the above doesn't work, maybe try this:                                                                                                                                                                        
                                                                                                                                                                                                                    
# https://bbs.archlinux.org/viewtopic.php?id=144702                                                                                                                                                                 
# echo 3 > /proc/sys/vm/drop_caches                                                                                                                                                                                 
# echo 1 > /proc/sys/vm/drop_caches                                                                                                                                                                                 
# schedtool -D -n 19 `pidof kswapd0