Hello Gabriel, thank you for your interest in my problem ! I'm quite sure that my cache is assembled: omitting to register my two devices in linuxrc leads to my lvm not being found (which is quite logical I think): echo /dev/sda4 > /sys/fs/bcache/register echo /dev/sdb > /sys/fs/bcache/register Anyway, here is the result of the command you requested: $ ls -d /sys/fs/bcache/*/bdev* /sys/fs/bcache/< cache set >/bdev0 I'd be glad to provide more info as needed, Thanks in advance, Leslie. On Thu, May 2, 2013 at 7:50 AM, Gabriel de Perthuis <g2p.code@xxxxxxxxx> wrote: >> 2. I have setup an LVM above bcache, and /dev/sda4 is the only cache >> partition. The whole thing was setup with: >> >> make-bcache -B /dev/sda4 -C /dev/sdb >> >> the LVM is "inside" /dev/sda4 >> 3. I am using fio as a benchmark, have setup writeback >> # cat /sys/block/bcache0/bcache/writeback_running >> 1 >> and I think I have followed every hints I could found about performance tuning. >> Yet, when running the ssd fio test suite on a file on partition that >> is not "cached", I am obtaining the following figures: >> seq-read: iops=29156 >> rand-read: iops=291 >> seq-write: iops=22355 >> rand-write: iops=260 >> >> Running it on a cached file system I'm obtaining: >> seq-read: iops=22196 >> rand-read: iops=330 >> seq-write: iops=15864 >> rand-write: iops=387 >> >> What am I missing ? > > Outside of the make-bcache, none of the commands you give in the thread > prove that the cache is assembled (it's actually possible to have > writeback_running = 1 with a detached bdev, though that's a bug in my > opinion). What does `ls -d /sys/fs/bcache/*/bdev*` show? > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-bcache" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
