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Re: NetBSD disk performance on VirtualBox

On Sun, 18 Mar 2018 15:00:40 +0100
Martin Husemann <> wrote:

> On Sun, Mar 18, 2018 at 01:41:46PM +0000, Sad Clouds wrote:
> > Hello, are there known I/O performance issues with NetBSD on
> > VirtualBox? I've setup two similar VMs, one Linux, another one
> > NetBSD, both use SATA virtual controller with one disk.
> > 
> > Writing 1GB file sequentially:
> > - Linux gives 425MB/sec,
> > - NetBSD gives 27MB/sec.
> > 
> How exatctly do you measure this?
> Martin

Hello, I tend to use dd to estimate I/O throughput

dd if=/dev/zero of=out bs=1m count=1000

I also used my own tool, which is similar to dd, but explicitly calls
fsync() before calculating throughput, that gave similar results.

The VirtualBox host is Linux with Samsung Evo 850 Pro SSD, which is
capable of around 420MB/sec to a local XFS file system.

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