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Re: NetBSD disk performance on VirtualBox

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 <> 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.


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