linux-kernel - Re: [linux-next:master] [drivers/char/mem] 1b057bd800: stress-ng.splice.ops_per

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Message-ID: <CAKPOu+8r1QpFUCyMMS04GOi-+HqM7-dxR4JcoLXfvXARobbZDA@mail.gmail.com>
Date:   Wed, 18 Oct 2023 12:01:45 +0200
From:   Max Kellermann <max.kellermann@...os.com>
To:     Oliver Sang <oliver.sang@...el.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        oe-lkp@...ts.linux.dev, lkp@...el.com,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-kernel@...r.kernel.org, ying.huang@...el.com,
        feng.tang@...el.com, fengwei.yin@...el.com
Subject: Re: [linux-next:master] [drivers/char/mem] 1b057bd800:
 stress-ng.splice.ops_per_sec -99.8% regression

On Wed, Oct 18, 2023 at 9:07 AM Oliver Sang <oliver.sang@...el.com> wrote:
> it found a (very big) regression comparing to parent commit.
>
> 19e3e6cdfdc73400 1b057bd800c3ea0c926191d7950
> ---------------- ---------------------------
>          %stddev     %change         %stddev
>              \          |                \
>   12433266           -99.8%      22893 ą  3%  stress-ng.splice.ops_per_sec

Oliver, how is it possible that we have three times the throughput
(MB_per_sec) at 1/500ths the ops?