On Wed, Aug 1, 2012 at 1:01 PM, Marc MERLIN <marc@xxxxxxxxxxx> wrote: > So, clearly, there is something wrong with the samsung 830 SSD with linux > It it were a random crappy SSD from a random vendor, I'd blame the SSD, but > I have a hard time believing that samsung is selling SSDs that are slower > than hard drives at random IO and 'seeks'. You'd be surprised on how badly some vendors can screw up :) > First: btrfs is the slowest: > gandalfthegreat:/mnt/ssd/var/local# grep /mnt/ssd/var /proc/mounts > /dev/mapper/ssd /mnt/ssd/var btrfs rw,noatime,compress=lzo,ssd,discard,space_cache 0 0 Just checking, did you explicitly activate "discard"? Cause on my setup (with corsair SSD) it made things MUCH slower. Also, try adding "noatime" (just in case the slow down was because "du" cause many access time updates) -- Fajar -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
