Re: [Xen-devel] [xen-unstable test] 17139: regressions - FAIL

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 07/03/13 12:48, Jan Beulich wrote:
> > > > On 07.03.13 at 13:38, xen.org <ian.jackson@xxxxxxxxxxxxx> wrote:
> > flight 17139 xen-unstable real [real]
> > http://www.chiark.greenend.org.uk/~xensrcts/logs/17139/
> >
> > Regressions :-(
> >
> > Tests which did not succeed and are blocking,
> > including tests which could not be run:
> >   test-amd64-i386-xl-credit2    5 xen-boot                  fail REGR. vs. 16772
> George,
>
> pretty likely something you want to take a look at:
>
> Mar  7 02:39:54.552252 (XEN) ****************************************
> Mar  7 02:39:54.560215 (XEN) Panic on CPU 0:
> Mar  7 02:39:54.560256 (XEN) Assertion 'rt_credit >= 0' failed at 
> sched_credit2.c:1559
> Mar  7 02:39:54.560314 (XEN) ****************************************
Very interesting...  it seems that under certain circumstances, even if 
the scheduler sets a timer to pre-empt a VM for 200us, that the VM may 
run for >11ms.  Since the "reset" assumes that your negative credit will 
never be less than -200us, it merely adds 10ms.  So even after the 
reset, the VM is still in negative credits.
Let me see what I want to do about that...

 -George

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