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

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Message-ID: <20191209085559.GA5868@dhcp22.suse.cz>
Date:   Mon, 9 Dec 2019 09:55:59 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     kernel test robot <rong.a.chen@...el.com>
Cc:     David Howells <dhowells@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        lkp@...ts.01.org
Subject: Re: [pipe] 3c0edea9b2:  lmbench3.PIPE.bandwidth.MB/sec -17.0%
 regression

On Sun 08-12-19 23:39:49, kernel test robot wrote:
> Greeting,
> 
> FYI, we noticed a -17.0% regression of lmbench3.PIPE.bandwidth.MB/sec due to commit:
> 
> 
> commit: 3c0edea9b29f9be6c093f236f762202b30ac9431 ("pipe: Remove sync on wake_ups")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

Huh. How can something like that can even can get merged? No changelog,
no s-o-b?
-- 
Michal Hocko
SUSE Labs