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a="2577182" X-IronPort-AV: E=Sophos;i="6.27,195,1787036400"; d="scan'208";a="2577182" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by orvoesa110.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Nov 2026 07:19:12 -0800 X-CSE-ConnectionGUID: O1jdaZf+RrGeLRpQDUuL0A== X-CSE-MsgGUID: aLgUdfpwRiODbQ2YL6z+Ng== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,195,1787036400"; d="scan'208";a="6625429" Received: from smithj1-mobl2.amr.corp.intel.com (HELO [10.125.110.28]) ([10.125.110.28]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Nov 2026 07:19:10 -0800 Message-ID: <84ecf492-5a71-4871-a555-abb76a1402db@intel.com> Date: Wed, 4 Nov 2026 07:19:07 -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; 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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? To answer the question: I don't see anything obvious. These performance issues where the overhead is smeared across a bunch of places are among the most difficult to figure out. All I can suggest is to have the LLM that you've been using so far do some more digging and see if it can come up with anything else.