linux-kernel - Re: [PATCH] Kconfig.hz: Change default HZ to 1000

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Message-ID: <20250228103304.302289-1-afazekas@redhat.com>
Date: Fri, 28 Feb 2025 11:33:04 +0100
From: Attila Fazekas <afazekas@...hat.com>
To: qyousef@...alina.io
Cc: dietmar.eggemann@....com,
	frederic@...nel.org,
	jstultz@...gle.com,
	juri.lelli@...hat.com,
	linux-kernel@...r.kernel.org,
	mingo@...nel.org,
	peterz@...radead.org,
	rostedt@...dmis.org,
	saravanak@...gle.com,
	tglx@...utronix.de,
	vincent.guittot@...aro.org
Subject: Re: [PATCH] Kconfig.hz: Change default HZ to 1000 

The 250Hz was set as a middle ground.

There are still workloads which sensitive to cache misses
and to the time spent in ticks.

You still can loose ~1% performance with higher Hz,
It might not sound much, but if you are running thousands
of servers 1% loss can be a high cost.

There are many workloads out there where 100Hz is the better choice.