linux-kernel - Re: [percpu] ace7e70901: aim9.sync_disk_rw.ops_per

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Message-ID: <YJV+Vn9eGfIlxDQE@carbon.dhcp.thefacebook.com>
Date:   Fri, 7 May 2021 10:52:22 -0700
From:   Roman Gushchin <guro@...com>
To:     Oliver Sang <oliver.sang@...el.com>
CC:     Dennis Zhou <dennis@...nel.org>,
        Pratik Sampat <psampat@...ux.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "lkp@...ts.01.org" <lkp@...ts.01.org>,
        "lkp@...el.com" <lkp@...el.com>,
        "ying.huang@...el.com" <ying.huang@...el.com>,
        "feng.tang@...el.com" <feng.tang@...el.com>,
        "zhengjun.xing@...el.com" <zhengjun.xing@...el.com>
Subject: Re: [percpu]  ace7e70901:  aim9.sync_disk_rw.ops_per_sec -2.3%
 regression

On Fri, May 07, 2021 at 11:06:06AM +0800, Oliver Sang wrote:
> hi Roman,
>  
> On Thu, May 06, 2021 at 12:54:59AM +0000, Roman Gushchin wrote:
> > Ping
> 
> sorry for late.
> 
> the new patch makes the performance a little better but still has
> 1.9% regression comparing to
> f183324133 ("percpu: implement partial chunk depopulation")

Hi Oliver!

Thank you for testing it!

Btw, can you, please, confirm that the regression is coming specifically
from ace7e70901 ("percpu: use reclaim threshold instead of running for every page")?
I do see *some* regression in my setup, but the data is very noisy, so I'm not sure
I can confirm it.

Thanks!