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From: "Chen, Rong A" <>
To: Peter Zijlstra <>
Cc: Kim Phillips <>,
	LKML <>,
	Linus Torvalds <>,
Subject: Re: [perf/x86/amd] 471af006a7: will-it-scale.per_process_ops -7.6% regression
Date: Fri, 14 Feb 2020 20:02:01 +0800
Message-ID: <> (raw)
In-Reply-To: <>

On 2/12/2020 8:18 PM, Peter Zijlstra wrote:
> 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.


Sorry for the inconvenience, the regression is stable on our platform, 
we're investigating it.

Best Regards,
Rong Chen

      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
2020-02-14 12:02   ` Chen, Rong A [this message]

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