Hi, the recent discussion/fixes re. readahead got me thinking: does btrfs use/benefit from a device's readahead setting (/sys/block/sdX/queue/read_ahead_kb) at all or it it completely ignored? Increasing the default from 128k can have drastic effects on other filesystems, but it's not clear (to me) whether this setting is ignored/circumvented by btrfs. I believe (but do not know/understand the details) that this relates to the implemenation of fs->readpages, which AFAIK is about to be replaced by a better/common readahead implementation..correct? Thanks! Holger
