LKML Archive on
 help / color / Atom feed
From: Peter Zijlstra <>
To: kernel test robot <>
Cc: Kim Phillips <>,
	LKML <>,
	Linus Torvalds <>,
Subject: Re: [perf/x86/amd] 471af006a7: will-it-scale.per_process_ops -7.6% regression
Date: Wed, 12 Feb 2020 13:18:30 +0100
Message-ID: <> (raw)
In-Reply-To: <20200212113514.GT12867@shao2-debian>

On Wed, Feb 12, 2020 at 07:35:14PM +0800, kernel test robot wrote:
> Greeting,
> FYI, we noticed a -7.6% regression of will-it-scale.per_process_ops due to commit:
> commit: 471af006a747f1c535c8a8c6c0973c320fe01b22 ("perf/x86/amd: Constrain Large Increment per Cycle events")
> master
> in testcase: will-it-scale
> on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 128G memory

That commit only changes code relevant to AMD machines; give you have
this result on an Intel machine makes me think the bisect is flawed.

  reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-12 11:35 kernel test robot
2020-02-12 12:18 ` Peter Zijlstra [this message]
2020-02-14 12:02   ` Chen, Rong A

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:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on

Archives are clonable:
	git clone --mirror lkml/git/0.git
	git clone --mirror lkml/git/1.git
	git clone --mirror lkml/git/2.git
	git clone --mirror lkml/git/3.git
	git clone --mirror lkml/git/4.git
	git clone --mirror lkml/git/5.git
	git clone --mirror lkml/git/6.git
	git clone --mirror lkml/git/7.git
	git clone --mirror lkml/git/8.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ \
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:

AGPL code for this site: git clone