linux-kernel - Re: Patch "mm, vmstat: make quiet_vmstat lighter" has been added to the 4.4-stable tree

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Date:   Wed, 11 Dec 2019 15:40:18 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     "zhangyi (F)" <yi.zhang@...wei.com>
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        cl@...ux.com, gregkh@...uxfoundation.org, mgalbraith@...e.de,
        torvalds@...ux-foundation.org, umgwanakikbuti@...il.com,
        wagi@...om.org, stable-commits@...r.kernel.org,
        "Wangkefeng (Maro)" <wangkefeng.wang@...wei.com>,
        Xie XiuQi <xiexiuqi@...wei.com>
Subject: Re: Patch "mm, vmstat: make quiet_vmstat lighter" has been added to
 the 4.4-stable tree

On Wed 11-12-19 22:32:49, zhangyi (F) wrote:
> Hi, all
> 
> We find a performance degradation under lmbench af_unix[1] test case after
> mergeing this patch on my x86 qemu 4.4 machine. The test result is basically
> stable for each teses.
> 
> Host machine: CPU: Intel(R) Xeon(R) CPU E5-2690 v3
>               CPU(s): 48
>               MEM: 193047 MB
> 
> Guest machine:  CPU: QEMU Virtual CPU version 2.5+
>                 CPU(s): 8
>                 MEM: 26065 MB

Does the same happen on the bare metal? Also what are the numbers for
the current vanilla kernel?
-- 
Michal Hocko
SUSE Labs