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Re: [Xen-devel] [xen-4.0.1-rc5-pre] [pvops] Complete freeze wi

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] [xen-4.0.1-rc5-pre] [pvops] Complete freeze within 2 days, no info in serial log
From: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Date: Sun, 8 Aug 2010 15:54:27 +0200
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
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Hi Konrad/Jeremy,

Previously i had a working setup, with the same VM i'm using now, but quite a 
few things have changed:

- Another motherboard
- Another processor
- Another USB controller (now usb3 pci-e instead of usb2 pci)

The freezes seem to be related to the USB3, but i'm not quite sure, since this 
also can give another workload.
What i have tried:
- latest xen-4.0-testing compiled with debug=y
- for dom0: latest 2.6.32 pvops stable kernel from Jeremy
- for dom0: latest 2.6.32 xen-next kernel from Jeremy
- added some kernel debug options(apart from some noise about hardirq's this 
doesn't seem to deliver a lot)
- for domU: 2.6.35-rc6 tree (devel/2.6.25-rc6-t2) from Konrad's tree.
- I also tried running without msi

It allways freezes at some point, but the time when seems to vary, although 
most of the time within a day.

- Done another memtest to be sure it isn't faulty memory, cooling is on max and 
temperatures are good, so that seems to be ruled out as well.

- I tried using the IOMMU, this should rule out DMA one should say, but it also 
froze with the IOMMU enabled and working, and again nothing in serial log :-(

The things i'm about to try after i have finished some backups are:
- xen-unstable
- running the VM as a HVM

What i'm wondering about is:

- Could the 4GB memory barrier still be a problem ? The machine has 8GB, and 
the domain normally would be started as one of the last, which totals up to 
around the 4GB of domains running.
  This night i let it run with only the troublesome pv domain, and it seems to 
work so far.
- Is there a way to force a domain to live underneath the 4GB or any other 
thing i could try out (besides ripping the ram out of the machine)
- Are there any other things that could prevent a full freeze by making things 
more strict cq provide addiontal debug info ?


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