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Re: [Xen-devel] [xen-unstable test] 128240: regressions - FAIL
- To: Wei Liu <wei.liu2@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Mon, 1 Oct 2018 16:19:07 +0100
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- Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Dario Faggioli <dario.faggioli@xxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, osstest service owner <osstest-admin@xxxxxxxxxxxxxx>
- Delivery-date: Mon, 01 Oct 2018 15:19:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 10/01/2018 04:17 PM, Wei Liu wrote:
> On Mon, Oct 01, 2018 at 09:10:25AM -0600, Jan Beulich wrote:
>>>>> On 01.10.18 at 16:33, <wei.liu2@xxxxxxxxxx> wrote:
>>> On Mon, Oct 01, 2018 at 03:04:02AM -0600, Jan Beulich wrote:
>>>>>>> On 30.09.18 at 23:59, <osstest-admin@xxxxxxxxxxxxxx> wrote:
>>>>> flight 128240 xen-unstable real [real]
>>>>> http://logs.test-lab.xenproject.org/osstest/logs/128240/
>>>>>
>>>>> Regressions :-(
>>>>>
>>>>> Tests which did not succeed and are blocking,
>>>>> including tests which could not be run:
>>>>> test-amd64-amd64-migrupgrade 22 guest-migrate/src_host/dst_host fail
>>>>> REGR. vs.
>>> 128084
>>>>
>>>> At the first glance
>>>>
>>>> libxl: error: libxl_sched.c:232:sched_credit_domain_set: Domain 1:Getting
>>> domain sched credit: Invalid argument
>>>> libxl: error: libxl_create.c:1275:domcreate_rebuild_done: Domain 1:cannot
>>> (re-)build domain: -3
>>>>
>>>> might indicate a problem resulting from the switch to credit2 as the
>>>> default
>>>> scheduler. But "first glance" here really means what it says - I didn't
>>>> look
>>>> (yet) at what exactly libxl tries to do there, in the hope that others may
>>>> know without much digging.
>>>
>>> I think this is due to toolstack trying to set the same scheduler
>>> parameters for the newly created guest.
>>>
>>> But in this test, the destination host is using a different scheduler
>>> from the source host. Asking for credit scheduler on a credit2 host is
>>> wrong.
>>>
>>> The relevant snippet in guest cfg (JSON) is:
>>>
>>> "sched_params": {
>>> "sched": "credit",
>>> "weight": 256,
>>> "cap": 0
>>> },
>>>
>>> I can't think of a method to fix it off the top of my head though.
>>
>> So is this something that was specified in the original config? Or
>> is it just the current value which gets read and an attempt made
>> to re-install. If there was no explicit setting in the guest config,
>> shouldn't such a "default" setting be retained by not transferring
>> any scheduler specifics during migration?
>>
>
> No setting in guest cfg. Those values are extracted from the hypervisor.
> I think we may be able to not send default values to the remote end.
Wait, the migration code reads the scheduler parameters -- even if these
have not been explicitly set by the admin -- and sends them along with
the migration stream? And if the remote scheduler is different, the
migration fails?
That's not so good. :-)
-George
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