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Re: [Xen-devel] [xen-unstable test] 128240: regressions - FAIL
- To: Dario Faggioli <dfaggioli@xxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Tue, 2 Oct 2018 11:06:22 +0100
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- Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, osstest service owner <osstest-admin@xxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
- Delivery-date: Tue, 02 Oct 2018 10:06:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 10/01/2018 06:58 PM, Dario Faggioli wrote:
> On Mon, 2018-10-01 at 18:07 +0200, Juergen Gross wrote:
>> On 01/10/2018 17:48, George Dunlap wrote:
>>> On 10/01/2018 04:40 PM, Andrew Cooper wrote:
>>>> On 01/10/18 16:35, Wei Liu wrote:
>>>>>> 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. :-)
>>>>>
>>>>> But one can argue that the guest is specific configured that
>>>>> way so it's
>>>>> parameters should be preserved. We normally analyse things on a
>>>>> case by
>>>>> case basis.
>>>>
>>>> If there isn't an obvious fix, then the switch of default
>>>> scheduler
>>>> needs reverting until there is a fix present. This is currently
>>>> blocking master.
>>>
>>> Agreed. I'd argue for ignoring failures to set scheduler
>>> parameters on
>>> migrate, on the grounds that this will be less risk to the project
>>> as a
>>> whole than reverting credit2 again. But either way we should do
>>> something quickly.
>>
>> We should ignore a mismatch of the scheduler. Failures when setting
>> parameters for a matching scheduler should not be ignored IMO.
>>
> Indeed! Especially considering that this isn't really related on what
> the default scheduler is (despite it being making Credit2 default that
> triggers the issue).
>
> In fact, what if:
> - user uses Credit1 (default and supported) on host A
> - user uses Credit2 (supported) on host B
> - user migrates VM
> - BOOOM!
>
> So, unless it is intended --and, I'd say, also documented somewhere--
> that migrating between hosts which use different schedulers is to be
> avoided, this is already a bug, whatever the default scheduler is...
>
> George, let me know if you're working on a fix already, or if I should
> do that myself.
I reverted the credit2 default; but really we need to have a design
discussion about what we want the overall behavior to be. It's not
simple or obvious.
-George
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