linux-kernel - Re: [RFT][PATCH v1 0/5] cpuidle: menu: Avoid discarding useful information when processing recent idle intervals

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Message-ID: <CAJZ5v0giy4ZhQdLXJXQqg+vMeP6TWZodWfwVVjbSuFz5_FEvMw@mail.gmail.com>
Date: Fri, 7 Feb 2025 16:45:58 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>, Linux PM <linux-pm@...r.kernel.org>, 
	LKML <linux-kernel@...r.kernel.org>, Daniel Lezcano <daniel.lezcano@...aro.org>, 
	Christian Loehle <christian.loehle@....com>, Aboorva Devarajan <aboorvad@...ux.ibm.com>
Subject: Re: [RFT][PATCH v1 0/5] cpuidle: menu: Avoid discarding useful
 information when processing recent idle intervals

On Fri, Feb 7, 2025 at 3:48 PM Artem Bityutskiy
<artem.bityutskiy@...ux.intel.com> wrote:
>
> Hi,
>
> thanks for the patches!
>
> On Thu, 2025-02-06 at 15:21 +0100, Rafael J. Wysocki wrote:
> > Hi Everyone,
> >
> > This work had been triggered by a report that commit 0611a640e60a ("eventpoll:
> > prefer kfree_rcu() in __ep_remove()") had caused the critical-jOPS metric of
> > the SPECjbb 2015 benchmark [1] to drop by around 50% even though it generally
> > reduced kernel overhead.  Indeed, it was found during further investigation
> > that the total interrupt rate while running the SPECjbb workload had fallen as
> > a result of that commit by 55% and the local timer interrupt rate had fallen
> > by
> > almost 80%.
>
> I ran SPECjbb2015 with and it doubles critical-jOPS and basically makes it
> "normal" again. Thanks!
>
> Reported-by: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
> Tested-by: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>

Thank you!