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Wed, 18 Oct 2023 01:12:32 -0700 (PDT) MIME-Version: 1.0 References: <202310172247.b9959bd4-oliver.sang@intel.com> <2023101759-front-ember-6354@gregkh> <2023101836-backtalk-mystified-d197@gregkh> In-Reply-To: <2023101836-backtalk-mystified-d197@gregkh> From: Max Kellermann Date: Wed, 18 Oct 2023 10:12:21 +0200 Message-ID: Subject: Re: [linux-next:master] [drivers/char/mem] 1b057bd800: stress-ng.splice.ops_per_sec -99.8% regression To: Greg Kroah-Hartman Cc: Oliver Sang , oe-lkp@lists.linux.dev, lkp@intel.com, Linux Memory Management List , linux-kernel@vger.kernel.org, ying.huang@intel.com, feng.tang@intel.com, fengwei.yin@intel.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Stat-Signature: g3zsay8q385dc4yodqnw1icptr8t1mwy X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 3CF954001A X-Rspam-User: X-HE-Tag: 1697616753-821936 X-HE-Meta: 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 IWLK3JbJ fsazC5VyDLwlc1SbsCB1wzW5OhHAS41nQTCpDOQ9sUNYEqc1jZLreQfxCaYkUsPdmPzDOqFS2TFfwzqN40sJiHfHQwTSu4LPiMkhizVYQZoF/dCpTO3wEk+G5K2uihI1YGWfeXZztBUWxQBxcWCtobODLR660ZYP0VUTYR51Dwx5ef8FfQuG3mW4bFUGk01KvIWUGw6O3N+b4QpGY6zoTwpxUgKNkWvbZXfFArQukHNLydMpkNoq7Upzbi+fqiPyJynd6Zs/c1ANRVSDcqU5d20vcyYnxLtYRZ1+Z1NVW1PvSWFfQjJNQeQ672DPBf+ouAYWAEV6sWgIf3F5u/0oE0rOrQQunz78zO9KZ X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Oct 18, 2023 at 9:57=E2=80=AFAM Greg Kroah-Hartman 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.