linux-kernel - Re: [PATCH v8 00/25] timer: Move from a push remote at enqueue to a pull at expiry model

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Message-ID: <0de4ce43-bba5-4a6a-929a-7dc9bfea79cd@arm.com>
Date:   Thu, 19 Oct 2023 15:28:41 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     Anna-Maria Behnsen <anna-maria@...utronix.de>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, John Stultz <jstultz@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Eric Dumazet <edumazet@...gle.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Arjan van de Ven <arjan@...radead.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sebastian Siewior <bigeasy@...utronix.de>,
        Giovanni Gherdovich <ggherdovich@...e.cz>,
        "Gautham R . Shenoy" <gautham.shenoy@....com>,
        Srinivas Pandruvada <srinivas.pandruvada@...el.com>,
        K Prateek Nayak <kprateek.nayak@....com>
Subject: Re: [PATCH v8 00/25] timer: Move from a push remote at enqueue to a
 pull at expiry model



On 10/19/23 15:04, Anna-Maria Behnsen wrote:
> Hi Lukasz,
> 
> Lukasz Luba <lukasz.luba@....com> writes:
> 
> [...]
> 
>>
>> I have tested this on my 2 Arm boards with mainline kernel
>> and almost-mainline. On both platforms it looks stable.
>> The results w/ your patchset looks better.
>>
> 
> Thanks for testing!

You're welcome


> 
> [...]
> 
>> The performance looks good. Only one test 'Speedometer'
>> has some interesting lower score.
> 
> Is it required to look into this more detailed or is the regression in a
> acceptable range for you?

That's something which we can ignore. I have tested with a different
cpu idle governor and it goes away. So, I suspect that the governor
heuristic just probably was confused. I will spend some time on
different idle governor tuning.

Feel free to go forward with this patch set.

> 
>>
>> Fill free to add:
>>
>> Tested-by: Lukasz Luba <lukasz.luba@....com>
> 
> Thanks,
> 
> 	Anna-Maria
>