On Sat, Sep 20 2014 at 10:19am -0400, lilofile <lilofile@xxxxxxxxxx> wrote: > when I test Thinly-Provisioned Logical Volumes(use device thinprovison > target),I found the random write performance is very low. What factors > will influence the random write performance of thin volume. It is worth reading this blog post from Joe: http://device-mapper.org/blog/2014/01/21/random-io-and-copy-on-write-schemes/ > how can i quickly understand dm-bufio.c? What is it you'd like to know? dm-bufio.c isn't the smoking gun for random write performance being slow though. It is more to do with the natural impact random writes have on thinp (as discussed in the above article). -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
