AW: [Xen-users] [SOLVED] Anyone have success with ivtv in a pvm? I got DMA TIMEOUT messages on xen-next/4.0-rc9-pre...

[Carsten Schiers <carsten@xxxxxxxxxx>]

Sorry, just want to make sure I know what exactly worked that well, as I want 
to try it
on my 3 DVB-C VDR system: the pv_ops kernel used is that which comes default 
with Xen 4.0?

BR,
Carsten.

----- Originalnachricht -----
Von: Mark Hurenkamp <mark.hurenkamp@xxxxxxxxx>
Gesendet: Don, 1.4.2010 00:55
An: xen-users@xxxxxxxxxxxxxxxxxxx
Cc: Ben Holt <ben@xxxxxxxxxxxxxxxx>
Betreff: Re: [Xen-users] [SOLVED] Anyone have success with ivtv in a pvm? I     
got DMA TIMEOUT messages on xen-next/4.0-rc9-pre...

> > I can now confirm that mythtv with 3 ivtv tuners is working well in my PV
> > DomU. I've had the system up and running for about a day now, and
> > recorded 3 parallel movies today.
> > Even when it ran out of disk space at one point, there were no unexpected
> > issues in the DomU nor in the Dom0, and after cleaning up the disk, and
> > restarting mythtv, recording continued without any problems.
> >
> > I'm impressed!
> 
> Just catching up on my list reading.
> 
> I've been running a mythtv backend on a domU for a while now with
> reasonable results.  
The reason i was impressed is that it works on xen 4.0 with a pvops kernel, 
which only recently got a working pciback/pcifront implementation to do pci 
passthrough.

> Two things I've had issues with that you may run into are:
> 
> - PCI latency - the ivtv driver tries to change the pci latency for the
> tuners when it is loaded, but can't because it doesn't have permission.
> I've tried to set the latency on boot from the dom0, but without
> success.  Changing it manually seems to work fine, not sure what the
> issue is here, but haven't spent any real time looking into it.  More on
> mythtv and pci latency here http://www.mythtv.org/wiki/PCI_Latency
Thanks for the info, the tweaks on that page may prove useful if i need to 
improve performance on my system (could have helped my previous setup).
My new (P55 based) system doesn't seem to have any problems with throughput or 
latency at this point.

> - DMA interrupts issues - about once a month my system starts reporting
> problems with DMA interrupts.  Sometimes this only takes out a single
> ivtv tuner, other times it takes out a NIC, HD, the Mythtv DomU, or the
> Dom0.  The only way to sort it out is to reboot the Dom0.  I've spent
> more time on this than I'd care to admit, and have very little to show
> for the work.  Because it happens so infrequently I'm not even 100% sure
> it's ivtv related.  Most recently I've pulled the ivtv tuners out of the
> system entirely and am hoping that in a month and a bit I'll know
> whether ivtv is involved or not.
Haven't seen these issues at all... not even on my old 1.2Ghz AMD Duron based
system... What version of xen and linux kernel are you running?


Mark.

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