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Wed, 18 Oct 2023 03:01:56 -0700 (PDT) MIME-Version: 1.0 References: <202310172247.b9959bd4-oliver.sang@intel.com> <2023101759-front-ember-6354@gregkh> In-Reply-To: From: Max Kellermann Date: Wed, 18 Oct 2023 12:01:45 +0200 Message-ID: Subject: Re: [linux-next:master] [drivers/char/mem] 1b057bd800: stress-ng.splice.ops_per_sec -99.8% regression To: Oliver Sang Cc: Greg Kroah-Hartman , 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-Rspamd-Queue-Id: C71844000D X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: 3isr1ezg1n7tdo88ta4ibumhp6pgtzer X-HE-Tag: 1697623318-354691 X-HE-Meta: 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 4IOfnzMP v3GvLj/O3xw7XXCCkcuheus3vPTS0wnfiIr34gI75IxkbIdSrFVbwHDiMicy7Bi/S470NPcEKds5xN4qkoNaRDww20fD5KNQ4Euil/Fx8tMwF7pVWPhwwwFOQzd3LdPvLMqB0Gvtqv3lP7wUzsw3vdTFE4+owSPQsvGp5z0/HiCwor0MXV9Ea3vVNpzTBb8S7irAO8W15mEwDCpKQv3zHzKSwGLaZ/aIRB/SaXhd35ws8qyrEXDHLJPHTdP/+1ZESNAqYf2tpUjY/9xNDCuYiIdAWFk9DTOSNA91n 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 9:07=E2=80=AFAM Oliver Sang = wrote: > it found a (very big) regression comparing to parent commit. > > 19e3e6cdfdc73400 1b057bd800c3ea0c926191d7950 > ---------------- --------------------------- > %stddev %change %stddev > \ | \ > 12433266 -99.8% 22893 =C4=85 3% stress-ng.splice.ops_p= er_sec Oliver, how is it possible that we have three times the throughput (MB_per_sec) at 1/500ths the ops?