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X-IronPort-AV: E=McAfee;i="6600,9927,11003"; a="4243983" X-IronPort-AV: E=Sophos;i="6.06,204,1705392000"; d="scan'208";a="4243983" Received: from orviesa007.jf.intel.com ([10.64.159.147]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Mar 2024 09:58:55 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.06,204,1705392000"; d="scan'208";a="9479142" Received: from takchich-mobl1.amr.corp.intel.com (HELO [10.209.93.46]) ([10.209.93.46]) by orviesa007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Mar 2024 09:58:55 -0800 Message-ID: Date: Mon, 4 Mar 2024 09:58:53 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [linus:master] [x86/bugs] 6613d82e61: stress-ng.mutex.ops_per_sec -7.9% regression Content-Language: en-US To: kernel test robot , Pawan Gupta Cc: oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, Dave Hansen , kvm@vger.kernel.org, ying.huang@intel.com, feng.tang@intel.com, fengwei.yin@intel.com References: <202403041300.a7fb1462-yujie.liu@intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 3/3/24 21:53, kernel test robot wrote: > kernel test robot noticed a -7.9% regression of stress-ng.mutex.ops_per_sec on: > > commit: 6613d82e617dd7eb8b0c40b2fe3acea655b1d611 ("x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key") > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master This _looks_ like noise to me. Some benchmarks went up, some went down. The differential profile shows random gunk that basically amounts to "my computer is slow" because it's mostly things that change when the result changes, like: > 182670 +9.0% 199032 stress-ng.mutex.nanosecs_per_mutex Does anyone think there's something substantial to chase after here?