On Mon, 19 Mar 2018 16:17:33 +0100 Martin Husemann <mar...@duskware.de> wrote:
> On Mon, Mar 19, 2018 at 12:06:44PM +0000, Sad Clouds wrote: > > 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. > > I am not sure it makes sense to benchmark the host IO performance in > this context ;-) > > However: I have the default settings, PIIX4. This is netbsd-8 GENERIC, > as of a few days ago. > > Turning off the host IO cache makes no measurable difference for me. > > Martin Hmm... something strange is going on here, I can't get anywhere close to the throughput that you're getting on a NetBSD-8 VM, and I use similar settings. I'm running VirtualBox 5.2.8 and changing "Use Host I/O Cache" made no difference for me, max throughput is always around 50 MBytes/sec.
