On Mon, Nov 21, 2016 at 05:13:41AM +0800, Coly Li wrote:

Hi Marc,

Could you please give me an exact procedure that how the environment is
configured, and how the commands are executed ? I will try them on my
machine to reproduce it.

Well, let's see:

source and destination look like this:
mdadm raid 5 \
ssd bcache ----  dmcrypt - btrfs 

Then I do a 10TB btrfs send from dev1 to dev2

The exact commands, some I typed a long time ago. This is live data, not
a test environment I just spin up for testing.
That said, is that what you were asking about?

But as I said, right now I removed the caching device from dev2, so
bcache is still there but doing nothing, and I'm still getting kernel
OOM problems as per http://pastebin.com/2LUicF3k

I'm currently testing 4.19rc5 to see if the VM changes help my case.

Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/                         | PGP 1024R/763BE901