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

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Message-ID: <CAKPOu+9bZtu80NncqLET_ycZcWynZFHuWGRC4HU2Od9NrsjnCw@mail.gmail.com>
Date:   Wed, 18 Oct 2023 10:12:21 +0200
From:   Max Kellermann <max.kellermann@...os.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Oliver Sang <oliver.sang@...el.com>, 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 9:57 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> That's odd given that as was pointed out, this test does not even touch
> the code paths that this patch changed.

I think I mixed up the "vmsplice" and the "splice" tests, and my
conclusion was wrong, sorry.
This performance regression is about the "splice" test which indeed
uses /dev/zero. I'll have a closer look and get back to you.