Seeing the same problem since upgrading from 15.10 to 16.04.
The vm.dirty workarounds and disabling swap don't make a difference.
Once this problem kicks in ALL disk writes become stupidly slow (2MB/s) until next reboot on both SSD and spinning HDD.
i5-4460/16Gb RAM/ASUS Z97-K
This is an enormous problem not to have at least been assigned to someone!
Seeing the same problem since upgrading from 15.10 to 16.04.
The vm.dirty workarounds and disabling swap don't make a difference.
Once this problem kicks in ALL disk writes become stupidly slow (2MB/s) until next reboot on both SSD and spinning HDD.
i5-4460/16Gb RAM/ASUS Z97-K
This is an enormous problem not to have at least been assigned to someone!