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

[Andy Burns <xen.lists@xxxxxxxxxxx>]

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?

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