[mythtv-users] Virtual Machines, USB tuners and PCI passthrough
craig.anderson0 at gmail.com
Wed Jul 21 00:10:11 UTC 2010
On 20 July 2010 23:20, Simon Hobson <linux at thehobsons.co.uk> wrote:
> Tyler T wrote:
> I tried to do PCI passthough in Xen a couple years ago and remember
>> lots of pain, perhaps it's better now ...
> I'm running a backend as a VM with PCI passthrough. I don't seem to
> remember having had any problems with that - and it's not exactly what you'd
> call up to date versions either. I actually do passthrough for two cards -
> one tuner for the Myth backend, and a network card for my firewall/gateway.
> One more thought: I believe SiliconDust sells a DVB version of the HD
>> HomeRun. If you go that route, a Gig-E NIC in your server should be
>> able to handle 6+ tuners no sweat, and no mucking about with USB
> However, you may hit another issue with Xen - network performance. AIUI the
> networking in Xen is single threaded, and so if your guests are hard on the
> network then performance can suffer. For that reason, using iSCSI in a guest
> sucks performance wise - but it's OK if you do the iSCSI in Dom0 and pass
> the result block device through as a virtual block device to the DomU.
> As a reference point, I run a single AMD64-2000 processor, 4G ram, a single
> 1.5TB WD Green drive, and a number of guests (mostly fairly lightly loaded).
> I've a single HVR 1110 PCI DVB tuner setup with 3 virtual tuners in MythTV.
> It will happily record two programs while I watch another, it seems to be
> just over the limit to record 3 while I watch one, and it definitely can't
> commflag a recording while recording two and watching another - I rather
> suspect I'm hitting the disk I/O limit of the single drive.
> On the whole, I reckon that you are likely to hit disk I/O limits long
> before you hit the Dom0 network bottleneck.
> At some point I'll be looking to upgrade and I've been thinking about how
> to arrange things. I could just do what I've got now, but with better
> hardware; or I'd considered running Myth on Dom0 and the rest as they are
Is Xen still the best solution? with RH not supporting it any longer and kvm
seemingly taking over?
Does HD Homerun come in a dvb-t and dvb-s2 varient? I am in a non dvb-c area
of the UK.
Anyone know if kvm or virtualbox (is it a rubbish solution to this problem?)
have the same network issues?
> Simon Hobson
> Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
> author Gladys Hobson. Novels - poetry - short stories - ideal as
> Christmas stocking fillers. Some available as e-books.
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