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Re: [Xen-devel] [PATCH] Make credit2 the default scheduler
- To: Dario Faggioli <dfaggioli@xxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Wed, 19 Sep 2018 11:10:28 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, "Ian Jackson <ian.jackson@xxxxxxxxxx>" <ian.jackson@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 19 Sep 2018 10:10:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 09/14/2018 01:29 PM, Dario Faggioli wrote:
> On Fri, 2018-09-14 at 09:45 +0100, Jan Beulich wrote:
>>>>> On 13.09.18 at 18:51, <dfaggioli@xxxxxxxx> wrote:
>>> I fully agree with and second George's reasoning, and feel 100%
>>> like
>>> providing my:
>>>
>>> Acked-by: Dario Faggioli <dfaggioli@xxxxxxxx>
>>
>> And that's despite "sched=credit2 crashes system when using
>> cpupools"?
>>
> Well, considering that, as you say, there's a fix on the mailing list
> already, yes.
>
> And I'm guessing George must feel kind of the same, as he sent this
> patch, before reviewing/committing the other.
Well, also because our team had just done our retrospective and noted
the state of credit2 (and I think Ian brought it up on IRC). It was
either "do it now" or "put it on a list to be done soon"; and my "list
of things to be done soon" is already too long. :-)
> In fact, the sooner we switch, the earlier OSSTest will start use
> Credit2 for everything, and show us whether or not there are other
> issues. And, speaking about that specific bug, OSSTest does not [sic!]
> test cpupools, so it's not even like it'll block pushes.
>
> That being said...
>
>> While I agree that we shouldn't delay the switch for
>> much longer, in particular with there already being a fix available
>> from you I think that one should go in before the one here.
>>
> ... I'm fine if maintainers/committers feels like waiting for the other
> patch to go in. The order in which they're committed, is something I
> have no control on. I don't think it's strictly necessary for this
> patch and the fix to hit the repo in a particular order. But if others
> do, no problem.
I feel the same way: I don't see any reason to delay, but I don't think
it's worth pressing the point when it's just a few days.
-George
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