Re: [Xen-devel] [xen-unstable test] 56759: regressions - FAIL

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi,

On 02/06/2015 06:30, Jan Beulich wrote:
> > > > On 29.05.15 at 18:32, <ian.campbell@xxxxxxxxxx> wrote:
> > On Wed, 2015-05-27 at 17:04 +0100, Ian Campbell wrote:
> > > Looking at the netback side though it seems like netback_remove is
> > > switching to state=Closed _before_ it calls kobject_uevent(...,
> > > KOBJ_OFFLINE) and it is this which generates the call to netback_uevent
> > > which tries and fails to read script and produces the error message.
> > I've just sent out a patch which fixes this issue, although I am still
> > at a loss to explain why we have only started seeing this now and only
> > under such specific circumstances.
> >
> > > I'm still slightly concerned that perhaps the new spinlock stuff has
> > > some sort of bad behaviour either on arndale specifically or more
> > > generally for ARM systems which has pushed this particular case over the
> > > edge.
> > I did run some benchmarks (hackbench+fio on arndale domU and hackbench
> > on midway dom0) with and without the ticket locks and the results were
> > close enough that I'm basically not too worried that there is something
> > wrong with the ticket locks on ARM.
> >
> > It still niggles somewhat not to have a good theory about why this
> > change had this seemingly random effect, but I've not got any good ideas
> > for avenues to explore and I've got other things to do so I think I'll
> > leave it at that.
> So should we then re-instate the ticket lock patches?
Any update on this?

Regards,

--
Julien Grall

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