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Date: Mon, 26 Nov 2012 01:19:17 -0600 (CST)
From: Bryan Venteicher <bryanv@daemoninthecloset.org>
To: Marek Salwerowicz <marek_sal@wp.pl>
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Subject: Re: FreeBSD Port: emulators/virtio-kmod - poor performance in
 VirtualBox
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Hi,

----- Original Message -----
> From: "Marek Salwerowicz" <marek_sal@wp.pl>
> To: kuriyama@FreeBSD.org
> Cc: ports@freebsd.org, emulation@freebsd.org
> Sent: Sunday, November 25, 2012 6:55:33 PM
> Subject: FreeBSD Port: emulators/virtio-kmod - poor performance in VirtualBox
> 
> Hi,
> 
> I would like to test the 'intnet' networking mode in VirtualBox 4.2.4
> (under FreeBSD 9.1-PRERELEASE), running 2 VMs with FreeBSD 9.1-RC3
> amd64
> each.
> 
> After installing your port kernel detected the 'virtio' interface and
> I
> configured the IP on both machines.
> 
> I used the 'ttcp' program to test the network performance between
> machines and I noticed that average transfer rate is around 6-7 KB/s
> (while using eg. the Intel emulator, |82540EM, it's much better,
> around
> 100 KB/s)

Even 100KB seems a couple of magnitudes slow for the emulated E1000
between 2 guests on the same host.

> 
> Do you have an idea why this is so slow?
> 

Try disabling checksum offloading (and TSO/LRO if Virtualbox supports
that).

> And why the if_vtnet network driver isn't provided in GENERIC kernel?
> Is it still under development?
> 

Getting it in GENERIC is in my plans. My spare time has been distracted
at some other Ethernet drivers for the last few weeks. I hope to spend
much of my spare time in Dec. on various VirtIO items.

Bryan


> Regards,
> 
> --
> Marek Salwerowicz
> |
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