From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=198.175.65.20 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793719425; b=tWE4hVW7DpfwvRPpwckeeTqMvO/OSAxTdUhYQ5Ec/I1NW3NMj0TN1lZ+TclTTJPHgVUo Dd91bBx4prqwV+Zn4odi4jzHpG7124g/xg03RL7iJltdNUNR3N8QumYioRAn/4OiMApVJ exjDMIaH50dtSDe2IX/0nKaNArV6FGF1mwZ5d9wfU+y8irw1kZtoNByMA/kGTbtr9ls4K 9SsLziYA9HX3Q3txNSHCRrt/iuwhY+/QHGs5kVwrUsptnLKR++F70L5HAIV+WUKYTiZXf iR0K7ui8vJtr6mJkOv9rPiumZm5U9XIHco9YOl42NipYr615BE5TVnRxl8wenOmJFcA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793719425; h=DMARC-Filter:DKIM-Signature:X-CSE-ConnectionGUID:X-CSE-MsgGUID: X-IronPort-AV:X-IronPort-AV:Received:X-CSE-ConnectionGUID: X-CSE-MsgGUID:X-ExtLoop1:X-IronPort-AV:Received:Message-ID:Date: MIME-Version:User-Agent:Subject:To:Cc:References:From: Content-Language:Autocrypt:In-Reply-To:Content-Type: Content-Transfer-Encoding; bh=UPu9l6SFeflYGcc8S7rOMMVuwvij60rnq0B8HRW6hQY=; b=ABiGVZRhwV6b1c9GF2776TC+1P9SM61d1GcFZfU06pF/YO8c8N/bol7zaYfmtZKUIC3X UozE0GVlOEG+1ahu/wxEVwI3jaicOzXj6Sg+w+R8UYyofxc8Y7ej8UC+r/ciNdf7lrCRR zOj/jaecCLUuSu9EbrVg0dtvDTSYeH4xK/tlPp02A0IwFBSXvvZti8Olh1rcqjHLLlKjK qM1n6jwY3s0jRhdKtXthSubFFLjd3EqcTZmvpsyhHSs52Yz7Bj1EA819fjRRqPSXdcohv /GImUzethxArxv691oeL60O8Df0OXgxhSWYaiAbBtIdp8V/Aga6bmnkzig1oiAcUsNQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=VW+tBmn2; arc=none smtp.remote-ip=198.175.65.20 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.20]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 859FF606B273; Tue, 3 Nov 2026 15:23:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 859FF606B273 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=VW+tBmn2 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1793719424; x=1825255424; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=UPu9l6SFeflYGcc8S7rOMMVuwvij60rnq0B8HRW6hQY=; b=VW+tBmn2GN1iYZOklTVxcvCrT2d/F5RcMfKtDTs38B++qauwZc1ZjOP+ ML0zqkE8UPKZAOnLbY/s7LURyBXSNY+YM5bpBx/TvB/hikta3PqLFfVBy EwZ/zbgZMVIMln9r9W90esSQErBaaxO2B87uGDQPY+5KbpLmYBQRem8BI L+Sx7CQGkGPD9yhuPRXNkv6bs30x2bbsXVTnzM5uWgFO6qCEcxrLXWADC wn46zcjWZ14gbfZdDhvdJboLcNfNOqZ/GyebagUTO/3Wr1xIZ75LJD16F hy7S5OJnbnDKn2auec+JbLlx9UPqJ91RiNvaOgkbvpNADesnBMNNHM9Ow w==; X-CSE-ConnectionGUID: JHlVqs52T1+gtHzth99JLg== X-CSE-MsgGUID: QsODZLFUSW+GILOSgyBB+g== X-IronPort-AV: E=McAfee;i="6800,10657,11955"; a="2477089" X-IronPort-AV: E=Sophos;i="6.27,193,1787036400"; d="scan'208";a="2477089" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by orvoesa112.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Nov 2026 07:23:43 -0800 X-CSE-ConnectionGUID: TawWlF+XR4qZZipRCE6h3g== X-CSE-MsgGUID: h0+D6UujQsakGwVBSz5dmA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,193,1787036400"; d="scan'208";a="6515881" Received: from rchatre-mobl4.amr.corp.intel.com (HELO [10.125.109.226]) ([10.125.109.226]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Nov 2026 07:23:42 -0800 Message-ID: <99b9d530-d962-4739-8f6e-83ee5c0e18a2@intel.com> Date: Tue, 3 Nov 2026 07:23:37 -0800 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 User-Agent: Mozilla Thunderbird Subject: Re: [linus:master] [x86/bugs] a3af84b0fa: stress-ng.seccomp.ops_per_sec 95.7% regression To: Chengfeng Lin , Pawan Gupta , Dave Hansen , Daniel Borkmann Cc: x86@kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org References: <202608191340.98574fe2-lkp@intel.com> <4h7zrdfpu3ailx5ajkyqohmcfuxgrk3tn7i7n3dkp3ksy5xehk@xqg5j6pqzocv> <179361623876.3.16264907931792312619.redis-ibpb-report@gmail.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; keydata= xsFNBE6HMP0BEADIMA3XYkQfF3dwHlj58Yjsc4E5y5G67cfbt8dvaUq2fx1lR0K9h1bOI6fC oAiUXvGAOxPDsB/P6UEOISPpLl5IuYsSwAeZGkdQ5g6m1xq7AlDJQZddhr/1DC/nMVa/2BoY 2UnKuZuSBu7lgOE193+7Uks3416N2hTkyKUSNkduyoZ9F5twiBhxPJwPtn/wnch6n5RsoXsb ygOEDxLEsSk/7eyFycjE+btUtAWZtx+HseyaGfqkZK0Z9bT1lsaHecmB203xShwCPT49Blxz VOab8668QpaEOdLGhtvrVYVK7x4skyT3nGWcgDCl5/Vp3TWA4K+IofwvXzX2ON/Mj7aQwf5W iC+3nWC7q0uxKwwsddJ0Nu+dpA/UORQWa1NiAftEoSpk5+nUUi0WE+5DRm0H+TXKBWMGNCFn c6+EKg5zQaa8KqymHcOrSXNPmzJuXvDQ8uj2J8XuzCZfK4uy1+YdIr0yyEMI7mdh4KX50LO1 pmowEqDh7dLShTOif/7UtQYrzYq9cPnjU2ZW4qd5Qz2joSGTG9eCXLz5PRe5SqHxv6ljk8mb ApNuY7bOXO/A7T2j5RwXIlcmssqIjBcxsRRoIbpCwWWGjkYjzYCjgsNFL6rt4OL11OUF37wL QcTl7fbCGv53KfKPdYD5hcbguLKi/aCccJK18ZwNjFhqr4MliQARAQABzUVEYXZpZCBDaHJp c3RvcGhlciBIYW5zZW4gKEludGVsIFdvcmsgQWRkcmVzcykgPGRhdmUuaGFuc2VuQGludGVs LmNvbT7CwXgEEwECACIFAlQ+9J0CGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEGg1 lTBwyZKwLZUP/0dnbhDc229u2u6WtK1s1cSd9WsflGXGagkR6liJ4um3XCfYWDHvIdkHYC1t MNcVHFBwmQkawxsYvgO8kXT3SaFZe4ISfB4K4CL2qp4JO+nJdlFUbZI7cz/Td9z8nHjMcWYF IQuTsWOLs/LBMTs+ANumibtw6UkiGVD3dfHJAOPNApjVr+M0P/lVmTeP8w0uVcd2syiaU5jB aht9CYATn+ytFGWZnBEEQFnqcibIaOrmoBLu2b3fKJEd8Jp7NHDSIdrvrMjYynmc6sZKUqH2 I1qOevaa8jUg7wlLJAWGfIqnu85kkqrVOkbNbk4TPub7VOqA6qG5GCNEIv6ZY7HLYd/vAkVY E8Plzq/NwLAuOWxvGrOl7OPuwVeR4hBDfcrNb990MFPpjGgACzAZyjdmYoMu8j3/MAEW4P0z F5+EYJAOZ+z212y1pchNNauehORXgjrNKsZwxwKpPY9qb84E3O9KYpwfATsqOoQ6tTgr+1BR CCwP712H+E9U5HJ0iibN/CDZFVPL1bRerHziuwuQuvE0qWg0+0SChFe9oq0KAwEkVs6ZDMB2 P16MieEEQ6StQRlvy2YBv80L1TMl3T90Bo1UUn6ARXEpcbFE0/aORH/jEXcRteb+vuik5UGY 5TsyLYdPur3TXm7XDBdmmyQVJjnJKYK9AQxj95KlXLVO38lczsFNBFRjzmoBEACyAxbvUEhd GDGNg0JhDdezyTdN8C9BFsdxyTLnSH31NRiyp1QtuxvcqGZjb2trDVuCbIzRrgMZLVgo3upr MIOx1CXEgmn23Zhh0EpdVHM8IKx9Z7V0r+rrpRWFE8/wQZngKYVi49PGoZj50ZEifEJ5qn/H Nsp2+Y+bTUjDdgWMATg9DiFMyv8fvoqgNsNyrrZTnSgoLzdxr89FGHZCoSoAK8gfgFHuO54B lI8QOfPDG9WDPJ66HCodjTlBEr/Cwq6GruxS5i2Y33YVqxvFvDa1tUtl+iJ2SWKS9kCai2DR 3BwVONJEYSDQaven/EHMlY1q8Vln3lGPsS11vSUK3QcNJjmrgYxH5KsVsf6PNRj9mp8Z1kIG qjRx08+nnyStWC0gZH6NrYyS9rpqH3j+hA2WcI7De51L4Rv9pFwzp161mvtc6eC/GxaiUGuH BNAVP0PY0fqvIC68p3rLIAW3f97uv4ce2RSQ7LbsPsimOeCo/5vgS6YQsj83E+AipPr09Caj 0hloj+hFoqiticNpmsxdWKoOsV0PftcQvBCCYuhKbZV9s5hjt9qn8CE86A5g5KqDf83Fxqm/ vXKgHNFHE5zgXGZnrmaf6resQzbvJHO0Fb0CcIohzrpPaL3YepcLDoCCgElGMGQjdCcSQ+Ci FCRl0Bvyj1YZUql+ZkptgGjikQARAQABwsFfBBgBAgAJBQJUY85qAhsMAAoJEGg1lTBwyZKw l4IQAIKHs/9po4spZDFyfDjunimEhVHqlUt7ggR1Hsl/tkvTSze8pI1P6dGp2XW6AnH1iayn yRcoyT0ZJ+Zmm4xAH1zqKjWplzqdb/dO28qk0bPso8+1oPO8oDhLm1+tY+cOvufXkBTm+whm +AyNTjaCRt6aSMnA/QHVGSJ8grrTJCoACVNhnXg/R0g90g8iV8Q+IBZyDkG0tBThaDdw1B2l asInUTeb9EiVfL/Zjdg5VWiF9LL7iS+9hTeVdR09vThQ/DhVbCNxVk+DtyBHsjOKifrVsYep WpRGBIAu3bK8eXtyvrw1igWTNs2wazJ71+0z2jMzbclKAyRHKU9JdN6Hkkgr2nPb561yjcB8 sIq1pFXKyO+nKy6SZYxOvHxCcjk2fkw6UmPU6/j/nQlj2lfOAgNVKuDLothIxzi8pndB8Jju KktE5HJqUUMXePkAYIxEQ0mMc8Po7tuXdejgPMwgP7x65xtfEqI0RuzbUioFltsp1jUaRwQZ MTsCeQDdjpgHsj+P2ZDeEKCbma4m6Ez/YWs4+zDm1X8uZDkZcfQlD9NldbKDJEXLIjYWo1PH hYepSffIWPyvBMBTW2W5FRjJ4vLRrJSUoEfJuPQ3vW9Y73foyo/qFoURHO48AinGPZ7PC7TF vUaNOTjKedrqHkaOcqB185ahG2had0xnFsDPlx5y In-Reply-To: <179361623876.3.16264907931792312619.redis-ibpb-report@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/2/26 02:43, Chengfeng Lin wrote: > I found another workload affected by a3af84b0fa00 while running MMTests: > Redis ZPOPMIN throughput on v7.3 is about 13% lower than on v7.1.3. > Unlike the repeated filter loading discussed here, the slowdown remains > after the tasks that triggered the predictor flush (IBPB) have exited. > Can this cost be reduced while preserving the security protection? I'm puzzled by this result. Any chance you could collect some profiles and see where the difference is?