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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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?

Jan


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