root@winterfell:~/flexdrop# lsmod | grep flex root@winterfell:~/flexdrop# free -m [...] root@winterfell:~/flexdrop# ./insert.pl -verbose=0 -min-mb=5000 -> insmod flexdrop.ko kallsyms_lookup_name=0xffffffff810b6c40 verbose=0 min_mb=5000 root@winterfell:~/flexdrop# free -m [...] Now you will still be able to SSH on your server, ZFS won't anymore eat all your memory. Enjoy! Beware: Some functions needed to do the equivalent of a "echo 3 > /proc/sys/vm/drop_cache" but at a quite pace are not exported by the Linux Kernel module API. To use those needed functions, flexdrop will resolve some function symbols normally private using the kernel function "kallsyms_lookup_name" which is also not exported. To use "kallsyms_lookup_name", the insert.pl script will resolve it's address from /proc/kallsyms and will pass it to the flexdrop kernel module parameters... The remove (rmmod flexdrop) is safe, ie. it will unload cleanly.