From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=82.195.75.108 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793892492; b=Id3/+SXPPC5eku/0D0WhjQ64fU6Tunzxk4hJoE5iu/umJalNTLxsauT8OIp4P/aY4G9y rmUBwEdpHzUbzcvFMKC2ISDmYPWHN8Ww4FSLuS9YYg1iCWXVsgeIJVehZZ0CnpSkD0ww0 OvSFoh0L2MaFufPVb/4MSnWjlwo1lStXYM/xihZLitGvTyuZeSLJLIm7UvYRn27iyMoM7 bH+JdPvFrqcRe+N7Ftui7p9S+yGROt0JpK3weRA7WV0+PJ9k9sN+Fo9K5eVWt2VLR6xwn eVOo9a3zNxpPktE/qmtrdKu7Py78exKyvTQWot4PWHMu9WpVukMKcQcM+dKcZB0FtGQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793892492; h=DMARC-Filter:DKIM-Signature:Received:Date:From:To:Cc:Subject: Message-ID:References:MIME-Version:Content-Type:Content-Disposition: In-Reply-To:X-Debian-User; bh=xdwtOpkQzwoHFeFMltxpA/VozAeSoa5DuyFL+4EYsGw=; b=43T5zukVRStGSoV06Ip0Y3OLefOpNmelQdd/BQ6ptGL83UNsR8MboJXU2h84ppglROp3 Zsc4EMhhGrmwKOGxaEXW2MZCnkyozVgKhIbwLJB7r7L3lGjCFTe+7VxtOK78lAtUCZuF2 4BrdSUfJ/8rrk35UnlaZJRRM4AMj2RxvY95GdJRmuFc783BnG8XfC3QkAMofAruSCGtqC UZIgqxB16HOnd+hbccBpzfFw1ZWqdZbR6Rk3QpFc95RxpyVqvxbYNSfk7fCIqLRSOCIg0 qLE8vHgufa1kTN3qVvrLvE6pP1uVOyM0pAr2lemcErKHKW0qBq75Ma23lA1XGoPYExQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=debian.org; spf=pass smtp.mailfrom=debian.org; dkim=pass header.d=debian.org header.i=@debian.org header.a=rsa-sha256 header.s=smtpauto.stravinsky header.b=IP9HkLBv; arc=none smtp.remote-ip=82.195.75.108 Received: from stravinsky.debian.org (stravinsky.debian.org [82.195.75.108]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 056A1606A328; Thu, 5 Nov 2026 15:28:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 056A1606A328 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=debian.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=debian.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=debian.org header.i=@debian.org header.a=rsa-sha256 header.s=smtpauto.stravinsky header.b=IP9HkLBv DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=debian.org; s=smtpauto.stravinsky; h=X-Debian-User:In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=xdwtOpkQzwoHFeFMltxpA/VozAeSoa5DuyFL+4EYsGw=; b=IP9HkLBvbk1lubBdAmiZbHpFA9 pmSKXuo+F7hLxOjB8jN0rpCSPuAxdKbM5DekhKD4C8urwosbxfBF1Ls+frt9W/lW+G4nQWdIaIFn1 wrOWq862neCkfs2PDdh+EvKaJcSjr2EkCxh4dvS/BHYG/evoQTvH41Ta7VxvESnjhhHShpgoueDid 1zrma+AkOet2EIPQfEo8RpxzbS03YT6B263KZPvAXGlFFOPfErGqLE2UR3Io7T63rfcEh/0KTKVDM WjTMchqToIqhWOWVaUv18N7E0A5KQXaXjCijku1X5D7wdZl8lPECXLHUXb/tYb2v2J6RPVcT/dJ4v aRiLBlkQ==; Received: from authenticated-user by stravinsky.debian.org with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.96) (envelope-from ) id 1xOzNl-008atX-14; Thu, 05 Nov 2026 15:28:05 +0000 Date: Thu, 5 Nov 2026 07:28:00 -0800 From: Breno Leitao To: Christian Brauner Cc: kernel test robot , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, Mateusz Guzik , Oleg Nesterov , linux-fsdevel@vger.kernel.org Subject: Re: [linus:master] [fs/pipe] f7f4665dc5: lmbench3.PIPE.bandwidth.MB/sec 18.5% regression Message-ID: References: <202611041404.befe64cd-lkp@intel.com> <20261105-trommeln-einspannen-radius-ccb4e174e407@brauner> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261105-trommeln-einspannen-radius-ccb4e174e407@brauner> X-Debian-User: leitao On Thu, Nov 05, 2026 at 04:04:58PM +0100, Christian Brauner wrote: > On Thu, Nov 05, 2026 at 08:38:45AM +0800, kernel test robot wrote: > > kernel test robot noticed a 18.5% regression of lmbench3.PIPE.bandwidth.MB/sec on: > > > > commit: f7f4665dc520fd8bbc1db20e59945773e03744a0 ("fs/pipe: unify the page pools into a single per-pipe pool") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > @Breno can you reproduce this? > It's something we should at least investigate. Ack, I will check it , but not today unfortunately. I will come back to it tomorrow, and until end of week I will report my findings.