From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 079EA4350 for ; Mon, 7 Mar 2022 21:33:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1646688829; x=1678224829; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-transfer-encoding:mime-version; bh=P7fA5VAziyLx4eErnIxNtk976YKxMu7dfIcAeyiLxV0=; b=CtRBnAEk995hrpSLj8dkq0b8//iZBcS4hN5Heu9La8xxk/4tW+uY62er rmIKDt1Grhv+JE/SjhNmGNdOe00YefpNdEQeKVaSl7g4+6ijBu2q1k9Si lLOlVaVFvSgo7+0UGNW/RASGE6LjBoMxSLM8iqu3iYEWHNes7O0Z6wDQQ LDPLKsBMMRoB/p3j1sYwuT0tExMXkeVMip3u7KhxoPml5v4t8P4bwfkqM vfwZ2qvPVvstaS0gLKbGdsvI5rlwNLjdhN1qo7P82nK7Ht5K2t6UuoGkx ouLRXhCrYATESwtgw/vuFvf61qEjrfqD0R3GmnD74NU+ICjrxOomzEQ03 A==; X-IronPort-AV: E=McAfee;i="6200,9189,10279"; a="253341718" X-IronPort-AV: E=Sophos;i="5.90,163,1643702400"; d="scan'208";a="253341718" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Mar 2022 13:33:48 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.90,163,1643702400"; d="scan'208";a="687687259" Received: from fmsmsx602.amr.corp.intel.com ([10.18.126.82]) by fmsmga001.fm.intel.com with ESMTP; 07 Mar 2022 13:33:48 -0800 Received: from fmsmsx612.amr.corp.intel.com (10.18.126.92) by fmsmsx602.amr.corp.intel.com (10.18.126.82) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Mon, 7 Mar 2022 13:33:47 -0800 Received: from fmsmsx610.amr.corp.intel.com (10.18.126.90) by fmsmsx612.amr.corp.intel.com (10.18.126.92) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Mon, 7 Mar 2022 13:33:46 -0800 Received: from fmsmsx610.amr.corp.intel.com ([10.18.126.90]) by fmsmsx610.amr.corp.intel.com ([10.18.126.90]) with mapi id 15.01.2308.021; Mon, 7 Mar 2022 13:33:46 -0800 From: "Luck, Tony" To: "gregkh@linuxfoundation.org" , "Joseph, Jithu" CC: "Williams, Dan J" , "hdegoede@redhat.com" , "markgross@kernel.org" , "corbet@lwn.net" , "Raj, Ashok" , "dave.hansen@linux.intel.com" , "patches@lists.linux.dev" , "linux-kernel@vger.kernel.org" , "mingo@redhat.com" , "rostedt@goodmis.org" , "Shankar, Ravi V" , "tglx@linutronix.de" , "platform-driver-x86@vger.kernel.org" , "linux-doc@vger.kernel.org" , "hpa@zytor.com" , "bp@alien8.de" , "andriy.shevchenko@linux.intel.com" , "x86@kernel.org" Subject: RE: [RFC 08/10] platform/x86/intel/ifs: Add IFS sysfs interface Thread-Topic: [RFC 08/10] platform/x86/intel/ifs: Add IFS sysfs interface Thread-Index: AQHYLaZd5d+yEBuhdEqmhIRDOkET6qyu6T6AgAFSX4CABIOMgIAAGXcAgAABjACAAAs3AIAACG0AgAAIiACAAAmQgP//ejMg Date: Mon, 7 Mar 2022 21:33:46 +0000 Message-ID: <5129ec667d734f3da4043ce1b7df0439@intel.com> References: <20220301195457.21152-1-jithu.joseph@intel.com> <20220301195457.21152-9-jithu.joseph@intel.com> <188492dc80c017375da76d444347b1d00c2031f6.camel@intel.com> <7b9c788e-21dc-eedc-a1b4-9c6877fa48fe@intel.com> <33d0e764-86d9-8504-17fa-14b31c87de4e@intel.com> <7c620f8a-189e-5ac4-30fe-1fa14ba799ea@intel.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-reaction: no-action dlp-version: 11.6.401.20 x-originating-ip: [10.1.200.100] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 > > Also some context on test frequency: Hardware has strict rate limiting= of tests. > > Every core can be tested only once in every 30 minutes. So it is pointl= ess to test at high frequency. > > What limits this, the kernel? Microcode enforces the per-core repeat rate on the first implementation. But this limit isn't architectural. Future implementations may not have the same, or perhaps any, limit. -Tony