From: Attila Fazekas <afazekas@redhat.com>
To: qyousef@layalina.io
Cc: dietmar.eggemann@arm.com, frederic@kernel.org,
jstultz@google.com, juri.lelli@redhat.com,
linux-kernel@vger.kernel.org, mingo@kernel.org,
peterz@infradead.org, rostedt@goodmis.org, saravanak@google.com,
tglx@linutronix.de, vincent.guittot@linaro.org
Subject: Re: [PATCH] Kconfig.hz: Change default HZ to 1000
Date: Fri, 28 Feb 2025 11:33:04 +0100 [thread overview]
Message-ID: <20250228103304.302289-1-afazekas@redhat.com> (raw)
In-Reply-To: <20250210001915.123424-1-qyousef@layalina.io>
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.
next prev parent reply other threads:[~2025-02-28 10:33 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-10 0:19 Qais Yousef
2025-02-12 14:50 ` Joel Fernandes
2025-02-16 16:11 ` Qais Yousef
2025-02-23 7:50 ` Andrea Righi
2025-02-23 10:00 ` Ingo Molnar
2025-02-23 23:21 ` Qais Yousef
2025-02-24 13:16 ` Vincent Guittot
2025-02-24 23:23 ` Sean Christopherson
2025-02-13 8:24 ` Saravana Kannan
2025-02-16 16:29 ` Qais Yousef
2025-02-16 19:05 ` David Laight
2025-02-22 23:47 ` Qais Yousef
2025-02-28 10:33 ` Attila Fazekas [this message]
2025-03-02 12:05 ` David Laight
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20250228103304.302289-1-afazekas@redhat.com \
--to=afazekas@redhat.com \
--cc=dietmar.eggemann@arm.com \
--cc=frederic@kernel.org \
--cc=jstultz@google.com \
--cc=juri.lelli@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=peterz@infradead.org \
--cc=qyousef@layalina.io \
--cc=rostedt@goodmis.org \
--cc=saravanak@google.com \
--cc=tglx@linutronix.de \
--cc=vincent.guittot@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®