On Thu, 09 May 2013 07:13:56 +0800, Zhi Yong Wu wrote: > HI, all > > I saw that bcache will be merged into kernel upstream soon, so i > want to know if btrfs hot relocation support is still meanful, if no, > i will not continue to work on it. can anyone let me know this? > thanks.
bcache performance would be poor if Btrfs-raid1 is used; the hits will be spread across mirrors are random, bcache will have to cache twice as much and convergence could be slow. Hot tracking also has much more precise info about which files are hot, whereas bcache can't know anything about files that are in the page cache and risks evicting some of them. It all comes down to benchmarks, but these two situations could be easy wins for hot-reloc. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
