Re: can't get bache's sequential_cutoff to work

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Mhm works directly on block device but not with XFS on top.
Am 23.07.2013 22:31, schrieb Stefan Priebe:
It works fine if do really small block writes like this:

# dd if=/dev/zero of=/dev/bcache0 bs=100 count=5000000

Can anybody tell me why?

Stefan
Am 23.07.2013 21:41, schrieb Stefan Priebe:
It's 3.10 with bcache Updates from kent's for 3.10 branch.

Stefan

This mail was sent with my iPhone.

Am 23.07.2013 um 18:00 schrieb Jack Wang <jack.wang.usish@xxxxxxxxx
<mailto:jack.wang.usish@xxxxxxxxx>>:

Hi Stefan,

Strange, I tested bcache 2 month ago, mostly bcache-3.2 branch in
writeback mode, it works as claimed.

which kernel version are you using?

Jack


2013/7/23 Stefan Priebe - Profihost AG <s.priebe@xxxxxxxxxxxx
<mailto:s.priebe@xxxxxxxxxxxx>>

    Hi,

    maybe i missed something or maybe i'm just wrong.


    # cat /sys/block/bcache2/bcache/sequential_cutoff
    512k

    # cat /sys/block/bcache2/bcache/stats_five_minute/bypassed
    64.3M

    # dd if=/dev/zero of=/mnt/bcache2/ttt bs=4M count=1000 oflag=direct
    1000+0 records in
    1000+0 records out
    4194304000 bytes (4,2 GB) copied, 11,0348 s, 380 MB/s

    # cat /sys/block/bcache2/bcache/stats_five_minute/bypassed
    69.3M

    I also see only IOP/s an writes go to the SSD but not to the disk
    behind. What's wrong?

    Greets,
    Stefan
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