LXC no buffer and write rate slow

[pve2099]

Hello everyone,
I create a lxc as a samba server, but the write rate is slow.



but read rate is normal.


I use vmstat to monitor io, and found no buffer.


vmstat log:


Maybe no buff cause write rate slow?

I also create a vm to compare. It's working well.



vmstat log:


Write and read rate is normal.