Re: [Xen-devel] [xen-unstable test] 128240: regressions - FAIL

[Wei Liu <wei.liu2@xxxxxxxxxx>]

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.


Wei.

> 
> Jan
> 
> 
> 
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