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From: Peter Zijlstra <peterz@infradead.org>
To: kernel test robot <rong.a.chen@intel.com>
Cc: Kim Phillips <kim.phillips@amd.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	lkp@lists.01.org
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: <20200212121830.GR14897@hirez.programming.kicks-ass.net> (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")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git 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

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