Hello, which virtual controller do you use in VirtualBox and do you have "Use Host I/O Cache" selected on that controller? If yes, then you need to disable it before running I/O tests, otherwise it caches loads of data in RAM instead of sending it to disk.
On Mon, Mar 19, 2018 at 8:59 AM, Martin Husemann <mar...@duskware.de> wrote: > On Mon, Mar 19, 2018 at 08:54:12AM +0000, Chavdar Ivanov wrote: > > I'd be also interested in your setup - on a W10 hosted VBox (latest) on a > > fast M.2 disk I get approximately 5 times slower values, on -current > amd64, > > having disks attached to SATA, SAS and NVMe controllers (almost the same, > > the SAS one is a little slower than the rest, but nowhere near your > > figures. : > > Hmm, nothing special, latest VBox, Win7 host, plain old hard disk as > backend store with NTFS on a SATA disk. But the host has *plenty* of > memory, > maybe I should have used a larger dd to exhaust buffering. > > Martin >
