linux-kernel - Re: [PATCH V7 0/9] SCHED_DEADLINE server infrastructure

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Date: Fri, 21 Jun 2024 17:16:31 +0200
From: Daniel Bristot de Oliveira <bristot@...nel.org>
To: Vineeth Remanan Pillai <vineeth@...byteword.org>
Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 Juri Lelli <juri.lelli@...hat.com>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Dietmar Eggemann <dietmar.eggemann@....com>,
 Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
 Mel Gorman <mgorman@...e.de>, Daniel Bristot de Oliveira
 <bristot@...hat.com>, Valentin Schneider <vschneid@...hat.com>,
 linux-kernel@...r.kernel.org, Luca Abeni <luca.abeni@...tannapisa.it>,
 Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>,
 Thomas Gleixner <tglx@...utronix.de>, Joel Fernandes
 <joel@...lfernandes.org>, Shuah Khan <skhan@...uxfoundation.org>,
 Phil Auld <pauld@...hat.com>, Suleiman Souhlal <suleiman@...gle.com>,
 Youssef Esmat <youssefesmat@...gle.com>
Subject: Re: [PATCH V7 0/9] SCHED_DEADLINE server infrastructure

On 6/21/24 17:09, Vineeth Remanan Pillai wrote:
> On Fri, Jun 21, 2024 at 10:59 AM Daniel Bristot de Oliveira
> <bristot@...nel.org> wrote:
>>
>> On 6/21/24 16:41, Vineeth Remanan Pillai wrote:
>>> Sorry that I could not get to reviewing and testing this revision. In
>>> v6 we had experienced a minor bug where suspend/resume had issues with
>>> dlserver. Since suspend does not do dequeue, dlserver is not stopped
>>> and this causes the premature wakeups.
>>
>> Ouch! I will have a look next week on this. Do you guys know any other bug?
>>
>> an earlier report without necessarily a fix/work around is a good thing
>> for us to try to reproduce it/think about it as earlier as we can...
>>
> Sorry my mistake, I was buried in other things and missed reporting
> this earlier.

no worries.

> 
> There was another minor regression seen lately after we fixed the
> above issue- idle cpu was spending more time in C7 than C10 with the
> dlserver changes. This was reported very recently and we haven't
> investigated this much yet. Just a heads up and will keep you posted
> as we know more.

Maybe that is an expected side effect because of the timer for the server, AFAIR you
guys are using a short period large runtime (25ms/50ms)?

> Thanks,
> Vineeth