Re: [Xen-devel] [Bug] sched: credit2: Assertion failed

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Tue, 2016-02-02 at 01:18 -0500, Tianyang Chen wrote:
> The following script caused an unresponsive dom0 and it can not beÂ
> 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 createdÂ
> pool is also credit2. There is an assertion failure (see bug.txt),
> whichÂ
> is essentially the same thing I got when trying to make the new rtdsÂ
> 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.

Thanks and Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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