From: George Dunlap <george.dunlap@eu.citrix.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: xen-devel <xen-devel@lists.xen.org>
Subject: Re: [xen-unstable test] 17139: regressions - FAIL
Date: Thu, 7 Mar 2013 16:47:54 +0000 [thread overview]
Message-ID: <5138C4BA.7020506@eu.citrix.com> (raw)
In-Reply-To: <51389ABE02000078000C3ECD@nat28.tlf.novell.com>
On 07/03/13 12:48, Jan Beulich wrote:
>>>> On 07.03.13 at 13:38, xen.org <ian.jackson@eu.citrix.com> 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
prev parent reply other threads:[~2013-03-07 16:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-07 12:38 [xen-unstable test] 17139: regressions - FAIL xen.org
2013-03-07 12:48 ` Jan Beulich
2013-03-07 16:47 ` George Dunlap [this message]
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