linux-kernel - Re: [PATCH v2 1/2] time/timekeeping: Fix possible inconsistencies in

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Message-ID: <Z-vL3cVZuQ8XQXhG@localhost>
Date: Tue, 1 Apr 2025 13:19:57 +0200
From: Miroslav Lichvar <mlichvar@...hat.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: John Stultz <jstultz@...gle.com>, LKML <linux-kernel@...r.kernel.org>,
	Stephen Boyd <sboyd@...nel.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Frederic Weisbecker <frederic@...nel.org>,
	Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
	kernel-team@...roid.com, Lei Chen <lei.chen@...rtx.com>
Subject: Re: [PATCH v2 1/2] time/timekeeping: Fix possible inconsistencies in
 _COARSE clockids

On Tue, Apr 01, 2025 at 08:34:23AM +0200, Thomas Gleixner wrote:
> On Mon, Mar 31 2025 at 16:53, Miroslav Lichvar wrote:
> > Mult reduction	Updates/sec	Skew before	Skew after
> > 16		4		0.004		0.009
> > 16		16		0.011		0.069
> > 16		64		0.020		0.117
> > 64		4		0.013		0.012
> > 64		16		0.030		0.107
> > 64		64		0.058		0.879
> 
> Hrm.
> 
> Can you try the delta patch below?

It seems to improve the worst cases, but overall it's still
a regression.

Mult reduction	Updates/sec	Skew
16		4		0.012
16		16		0.014
16		64	        0.033
64		4		0.012
64		16		0.105
64		64		0.138

Thanks,

-- 
Miroslav Lichvar