Re: [Xen-devel] [xen-unstable test] 57852: regressions - FAIL

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Mon, 2015-06-08 at 10:27 +0100, Ian Campbell wrote:
> On Mon, 2015-06-08 at 10:15 +0100, Jan Beulich wrote:
> > >>> On 08.06.15 at 10:53, <ian.campbell@xxxxxxxxxx> wrote:
> > > That's 6/14 (43%) failure rate on fiano0 and 2/10 (20%) on fiano1. Which
> > > differs form the apparent xen-unstable failure rate. But I wouldn't take
> > > this as evidence that the two systems differ significantly, despite how
> > > the unstable results looked at first glance.
> > 
> > So we can basically rule out just one of the hosts being the culprit;
> > it's either both or our software. Considering that (again at the
> > example of the recent 4.2 flight) the guest is apparently waiting for
> > a timer (or other) interrupt (on a HLT instruction), this is very likely
> > interrupt delivery related, yet (as said before, albeit wrongly for
> > 4.3) 4.2 doesn't have APICV support yet (4.3 only lack the option
> > to disable it), so it can't be that (alone).
> > 
> > Looking at the hardware - are fiano[01], in terms of CPU and
> > chipset, perhaps the newest or oldest in the pool? (I'm trying to
> > make myself a picture of what debugging options we have.)
> 
> I don't know much about the hardware in the pool other than what can be
> gathered from the serial and dmesg logs.
> 
> http://logs.test-lab.xenproject.org/osstest/logs/58028/test-amd64-amd64-xl-qemuu-win7-amd64/info.html
> 
> From the serial log and this:
> 
> Jun  6 12:09:27.089020 (XEN) VMX: Supported advanced features:
> Jun  6 12:09:27.089052 (XEN)  - APIC MMIO access virtualisation
> Jun  6 12:09:27.097051 (XEN)  - APIC TPR shadow
> Jun  6 12:09:27.097088 (XEN)  - Extended Page Tables (EPT)
> Jun  6 12:09:27.097118 (XEN)  - Virtual-Processor Identifiers (VPID)
> Jun  6 12:09:27.105066 (XEN)  - Virtual NMI
> Jun  6 12:09:27.105100 (XEN)  - MSR direct-access bitmap
> Jun  6 12:09:27.105130 (XEN)  - Unrestricted Guest

Running with no-apicv seems to have disabled these three:

> Jun  6 12:09:27.113269 (XEN)  - APIC Register Virtualization
> Jun  6 12:09:27.113290 (XEN)  - Virtual Interrupt Delivery
> Jun  6 12:09:27.113328 (XEN)  - Posted Interrupt Processing

Is that expected?

The adhoc run passed, but that's not statistically significant.

Ian.


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