[dm-devel] System freeze for few seconds when using dm-cache on high load

[Michał Zubkowicz]

I'm using dm-cache on such setup:
dm-cache -> luks -> lvm2 ->ext4
Kernel version: 3.13.0-43

On high disk load (ie when saving virtual machine state) whole system 
freezes for a few seconds.
I've tried already to change scheduler (from deadline to cbq), change 
ext4 mount options, now i've got:
errors=remount-ro,noatime,nodiratime,discard,barrier=0,relatime

There is something I should check, or maybe it's a 'normal' behaviour, 
or maybe my  whole setup is wrong?

-- 
Best Regards
Michał Zubkowicz