The 3% reserve was added to the original code *because* users kept hitting problems where they couldn't recover. I suspect the tunable should nowdays be something related to min(3%, someconstant), at the time we did the 3% I think 1GB was an "enterprise system" ;) Alan -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>