linux-kernel - Re: [pipe] 3c0edea9b2: lmbench3.PIPE.bandwidth.MB/sec -17.0% regression

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Message-ID: <f96b092d-5b14-a795-819d-ad7536be4ba0@intel.com>
Date:   Wed, 11 Dec 2019 22:52:19 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Michal Hocko <mhocko@...nel.org>,
        David Howells <dhowells@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: Re: [pipe] 3c0edea9b2: lmbench3.PIPE.bandwidth.MB/sec -17.0%
 regression



On 12/11/2019 1:52 AM, Linus Torvalds wrote:
> On Tue, Dec 10, 2019 at 6:15 AM kernel test robot <rong.a.chen@...el.com> wrote:
>> Hi Linus,
>>
>> Sorry for the inconvenience, indeed, the regression has been fixed.
> Woohoo.. And more than fixed, it looks like. Not that I looked at
> historical data, I'm not sure how much this number normally
> fluctuates. I'm assuming the stddev is just a per-boot "do it a few
> times" rather than any long-term thing?
>
>                  Linus

Hi Linus,

Yes, the stddev is not very precise, we usually boot more than three 
times to
get the value.

Best Regards,
Rong Chen