Re: HVM performance deficiencies

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Thu, Jan 14, 2010 at 06:21:30PM +0100, Wolfgang Solfrank wrote:
> Hi,
>
> NetBSD has several performance deficiencies when run as an HVM guest
> under Xen.  The problem stems from the fact that the qemu hardware
> emulation isn't completely compatible with real hardware, and our
> drivers misidentify and/or misuse some features:

Wouldn't it be preferable to get virtio-net and virtio-disk going,
instead?  That would also improve NetBSD performance under VirtualBox.

QEMU supports other emulated hardware, right?  It might pay off more
to fix things like our bha or mpt drivers so they'll work with common
emulations, rather than the IDE driver -- the SCSI drivers will get
some concurrency, which can go a long way to hide the latency caused
by virtualization.

Thor