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Re: [Xen-devel] [PATCH] Make credit2 the default scheduler
- To: Wei Liu <wei.liu2@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Tue, 18 Sep 2018 17:21:18 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxx>
- Delivery-date: Tue, 18 Sep 2018 16:21:25 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 09/14/2018 10:02 AM, Wei Liu wrote:
> On Fri, Sep 14, 2018 at 02:45:35AM -0600, Jan Beulich wrote:
>>>>> On 13.09.18 at 18:51, <dfaggioli@xxxxxxxx> wrote:
>>> On Thu, 2018-09-13 at 17:38 +0100, George Dunlap wrote:
>>>> Credit2 was declared "supported" in 4.8, and as of 4.10 had two other
>>>> critical features implemented (soft affinity / NUMA and caps).
>>>>
>>>> [..]
>>>>
>>>> Credit2, like credit, has a number of workloads / setups for which
>>>> performance could be improved. Personally I think networking and
>>>> partially-loaded systems is going to be more representative of what
>>>> Xen is actually used for; so I think credit2 is on the whole the
>>>> better scheduler to use by default. And in any case, making those
>>>> improvements on credit2 will be easier than on credit.
>>>>
>>>> Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>
>>>>
>>> After all the effort we've spent on this, I'm really, really happy to
>>> see this (trying to) happen. Thanks for sending the patch. :-)
>>>
>>> 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"? While I agree that we shouldn't delay the switch for
>
> Urgh, this is a really nasty bug.
>
>> much longer, in particular with there already being a fix available
>> from you I think that one should go in before the one here.
>
> +1.
The other fix is in. I'll wait a few days and push this change, if
there are no objections.
-George
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