[Xen-users] Re: Re: Re: Re: MythTV and Xen

[Bastiaan <Bastiaan@xxxxxxxxxxxxxxx>]

sven waeyenbergh wrote:

> Dear list, FYI:
> 
> i have been running a mythbackend inside a domU for a long time now.
> I have "transported" 2 ivtv cards to this domU, and also a serial port for
> the external channel changer,
> that works just fine.
> 
> I'm using the standard xen kernel for debian etch with no special kernel
> options or anything else.
> 
> I did have to set some kernel options to get the domU kernel for the myth
> machine running.
> the options i used are : extra = "root=/dev/hda1 iommu=soft swiotlb=force"
> 
> some version info:
> ii  linux-image-2.6.18-4-xen-amd64      2.6.18.dfsg.1-12etch2
> Linux 2.6.18 image on AMD64
> ii  linux-modules-2.6.18-4-xen-amd64    2.6.18.dfsg.1-12etch2
> Linux 2.6.18 modules on AMD64
> ii  linux-modules-2.6.18-5-xen-amd64    2.6.18.dfsg.1-13etch6
> Linux 2.6.18 modules on AMD64
> ii  xen-hypervisor-3.0.3-1-amd64        3.0.3-0-4
> The Xen Hypervisor on AMD64
> ii  xen-linux-system-2.6.18-4-xen-amd64 2.6.18.dfsg.1-12etch2
> XEN system with Linux 2.6.18 image on AMD64
> ii  xen-utils-3.0.3-1                   3.0.3-0-4
> XEN administrative tools
> ii  xen-utils-common                    3.0.3-0-2
> XEN administrative tools - common files
> 
> 
> some notes:
> - before i did this 64bit version i tried to get this working on 32bit.
> However, it seemed that almost all ditributions are (were) switching to a
> PAE-enabled kernel. This kernel made the transfer of PCI cards very buggy.
> switching to 64bit and allocating enough memory on the domU (see swiotlb
> setting) solved these.
> - i'm using pciback hiding on dom0
> - my pvr500 (dual tuner) is connected to a simple cable, but my PVR150 is
> connected to a skybox STB that is connected to my dish. It uses an
> external channel changer that works very fine in myth.(see here:
> http://www.dusky-control.com/ )
> - don't forget to install the ivtv drivers & firmware on domU & regenerate
> the initrd.
> - at the moment i'm using the xen emulated network adapter on domU. I
> normally have only 1 or possibly 2 frontends on at any one time. I do have
> the feeling that i'm close to the maximum transfer speeds for the emulated
> adapter. i think that setups that need more than 2 FE's will also have to
> use an "exported, real" network card on domU for speed reasons. This could
> be related to the fact that i'm still using xen 3.0.3 and not 3.1. It
> seems like the 3.1 version will solve a lot of speed and i/o issues.
> 

I am using 6 inputs (4 tuners, one iptv test input and a cmera) and just
tryd to stream all 6 channels over a virtual network interface, without
trouble. (The real networkcard is a gigabit one, on a all gigabit network).

> Greetings,
> Sven



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