This bug still exists in even 4.4.0-xx x86 kernels, but the slow HDD writes disappears after I changed to amd64 kernel of the same versions even the userland is still 32-bit.
I did like as below.
sudo dpkg --add-architecture amd64 sudo apt-get update sudo apt-get install linux-image-generic:amd64
The virtualbox and nvidia modules compiled by DKMS become unusable though.
This bug still exists in even 4.4.0-xx x86 kernels, but the slow HDD writes disappears after I changed to amd64 kernel of the same versions even the userland is still 32-bit.
I did like as below.
sudo dpkg --add-architecture amd64 generic: amd64
sudo apt-get update
sudo apt-get install linux-image-
The virtualbox and nvidia modules compiled by DKMS become unusable though.