Re: [Xen-devel] PCI passthrough stopped working, brainache!

["Taylor, Neal E" <Neal.Taylor@xxxxxx>]

Andy,

Did I mess the solution for this or are you still working with 'mem=3.99999G'?

Neal Taylor
CA Technologies

-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Ian Campbell
Sent: Wednesday, October 26, 2011 1:05 AM
To: Andy Burns
Cc: xen-devel
Subject: Re: [Xen-devel] Re: PCI passthrough stopped working, brainache!

On Mon, 2011-10-24 at 12:30 +0100, Andy Burns wrote:
> On 15 October 2011 12:27, Andy Burns <xen.lists@xxxxxxxxxxx> wrote:
> 
> > On 15 October 2011 11:36, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> >
> >> I think you've got 8G of RAM so one thing which might be worth trying is
> >> to give "mem=2G"
> >
> > A coconut for the gentleman!
> 
> I can see that the devs have been busy getting their ducks in a row
> for when the 3.2 merge window opens (3.1 is released now) so not
> wanted to pester about this as it's OK for now with the workarounds.
> 
> Initially I tried mem=2G, with dom0_mem=512M and two domUs of 512M and
> 1G respectively, I presume this caused a bit of ballooning in dom0 as
> I caught it with 400M'ish at one point and I had a little instability.
> 
> I pushed it up to mem=3G and at the same time added irqpoll for dom0
> and the pci domU (because I was seeing a few "nobody cared" messages
> in the domU at bootup and in the dom0 after shutting down the domU)
> those changes so far have resulted in a stable setup.
> 
> Not wanting to reboot the dom0 just yet (would like to see how stable
> it really is) but want to think about things to try when I *do* reboot
> it,
> I'm assuming the DMA problem will rear its head again if I try mem >=
> 4G, I haven't tried anything with dma_bits yet either, anything other
> suggestions or logging that might help?

Konrad had some suggestions in
<20111020034000.GA2401@xxxxxxxxxxxxxxxxxxx> which would be worth trying.
(that mail was sent on Thursday but appears to have sat in a queue
somewhere until after you sent this mail so just checking you've seen
it).

Ian.



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