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Re: [Xen-devel] S3 is broken again in xen-unstable

On Thu, 2013-04-25 at 18:02 +0100, Ben Guthro wrote:
> On Thu, Apr 25, 2013 at 8:00 AM, Ben Guthro <ben@xxxxxxxxxx> wrote:
> > Since this is something that XenClient really relies on working, it
> > has been a pain point with every upgrade of Xen for us.
> > It is enormously time consuming to debug on every upgrade, and has a
> > long tail in discovering problems (I started debugging S3 last Aug on
> > xen-unstable, prior to 4.2 being cut)
> >
> > How can we work with the community to try to get some sort of
> > regression testing for this feature that we rely on in our product?
> I am still interested in ideas for getting this into automated
> testing, and any ideas people may have for this.

CCing Ian Jackson who runs the test infrastructure.

Contributing new tests is now less onerous than it once was (i.e. it
might even possible at all). There is some info at
although the branch may be out of date -- Ian was working on merging the
standalone branch at one point.

Some questions:
      * How automatable is s3?
      * In particular can we automate the wakeup? s3 is save to RAM
        IIRC, and most power control in the test system is done with PDU
        power cycling.
      * Would s3 ever be expected to work on the sorts of whitebox
        server systems which form the osstest pool or do we need to
        investigate additional hardware?
      * How hardware specific are the s3 failures -- we obviously can't
        have one of every laptop ever ;-)

So assuming the answers to the above are positive then contributing a
test case for s3 to the relevant flights seems like a reasonable first
step, even if the expectation is that it would always fail with the
current mainline Xen + mainline Linux. The test system only tracks
regressions, so always failing test cases are OK (you can think of this
in the test-drive development kind of way ;-)).

> Would it be helpful to maintain a branch in my xenbits repo that could
> be a rebased version of konrad's acpi-s3 patches against Linus' latest
> kernel?

What is keeping those out of Linus' tree?

Once we have a test case in the standard flights then we can consider
the options around new flights testing other trees.


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