linux-kernel - Re: [LKP] Re: [mm] 10befea91b: hackbench.throughput -62.4% regression

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Message-ID: <20210203024951.GA1837780@carbon.DHCP.thefacebook.com>
Date:   Tue, 2 Feb 2021 18:49:51 -0800
From:   Roman Gushchin <guro@...com>
To:     "Xing, Zhengjun" <zhengjun.xing@...el.com>
CC:     kernel test robot <oliver.sang@...el.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Shakeel Butt <shakeelb@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Michal Hocko <mhocko@...nel.org>, Tejun Heo <tj@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, <lkp@...ts.01.org>,
        <lkp@...el.com>
Subject: Re: [LKP] Re: [mm] 10befea91b: hackbench.throughput -62.4% regression

On Tue, Feb 02, 2021 at 04:18:27PM +0800, Xing, Zhengjun wrote:
> 
> 
> On 1/14/2021 11:18 AM, Roman Gushchin wrote:
> > On Thu, Jan 14, 2021 at 10:51:51AM +0800, kernel test robot wrote:
> > > Greeting,
> > > 
> > > FYI, we noticed a -62.4% regression of hackbench.throughput due to commit:
> > Hi!
> > 
> > Commit "mm: memcg/slab: optimize objcg stock draining" (currently only in the mm tree,
> > so no stable hash) should improve the hackbench regression.
> The commit has been merged into Linux mainline :
>  3de7d4f25a7438f09fef4e71ef111f1805cd8e7c ("mm: memcg/slab: optimize objcg
> stock draining")
> I test the regression still existed.

Hm, so in your setup it's about the same with and without this commit?

It's strange because I've received a letter stating a 45.2% improvement recently:
https://lkml.org/lkml/2021/1/27/83

Thanks!