Andrew, I'm getting around to pick up the readahead works again :-) This first series is mainly to add some debug facilities, to support the long missed backwards prefetching capability, and some old patches that somehow get delayed (shame me). The next step would be to better handle the readahead thrashing situations. That would require rewriting part of the algorithms, this is why I'd like to keep the backwards prefetching simple and stupid for now. When (almost) free of readahead thrashing, we'll be in a good position to lift the default readahead size. Which I suspect would be the single most efficient way to improve performance for the large volumes of casually maintained Linux file servers. Thanks, Fengguang -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>