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

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]

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

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 
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...


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