Re: [Bug] sched: credit2: Assertion failed

[Tianyang Chen <tiche@seas.upenn.edu>]

On 2/2/2016 3:29 AM, Dario Faggioli wrote:
> On Tue, 2016-02-02 at 01:18 -0500, Tianyang Chen wrote:
>> The following script caused an unresponsive dom0 and it can not be
>> reproduced all the time. The dom0 is using credit2 scheduler.
>>
>> #!/bin/bash
>> xl cpupool-list -c
>> xl cpupool-cpu-remove Pool-0 3
>> xl cpupool-cpu-remove Pool-0 2
>> xl cpupool-create name=\"r\" sched=\"credit\"
>> xl cpupool-create name=\"t\" sched=\"credit\"
>> xl cpupool-cpu-add r 3
>> xl cpupool-cpu-add t 2
>>
> Yes, this is known. It is because Credit2 does not support (hard)
> affinity. There is a series on the list by someone implementing that,
> but it needs refreshing, which I hope to get round to it soon.
>
>> Another bug can be reproduced(not all the time) if the newly created
>> pool is also credit2. There is an assertion failure (see bug.txt),
>> which
>> is essentially the same thing I got when trying to make the new rtds
>> scheduler cpupool safe.
>>
> This is also known, and it will be fixed when I'll get back and
> resubmit this:
>
> http://lists.xenproject.org/archives/html/xen-devel/2015-09/msg03811.html
>
> In fact, look at this patch:
> http://lists.xenproject.org/archives/html/xen-devel/2015-09/msg03813.html
>
> And I'll do that right in this days, so I'd say you can ignore this for
> RTDS (as it will get fixed by the same series).
>
> So both are known issues... I'll open bugs in our bugtraker for them to
> avoid forgetting or tripping over them again.
>

Got it, thanks for the heads up.

--
Tianyang