From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.4 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E288C433E7 for ; Wed, 14 Oct 2020 16:10:22 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 92DA721D7F for ; Wed, 14 Oct 2020 16:10:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="NOaMDIt9" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 92DA721D7F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.6847.17977 (Exim 4.92) (envelope-from ) id 1kSjLn-0003SF-V7; Wed, 14 Oct 2020 16:10:03 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 6847.17977; Wed, 14 Oct 2020 16:10:03 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kSjLn-0003Ra-RV; Wed, 14 Oct 2020 16:10:03 +0000 Received: by outflank-mailman (input) for mailman id 6847; Wed, 14 Oct 2020 16:10:02 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kSjLm-0003KW-HE for xen-devel@lists.xenproject.org; Wed, 14 Oct 2020 16:10:02 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 58938394-22fa-4520-8430-193962dc4735; Wed, 14 Oct 2020 16:10:00 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id B83B2AB95; Wed, 14 Oct 2020 16:09:59 +0000 (UTC) Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kSjLm-0003KW-HE for xen-devel@lists.xenproject.org; Wed, 14 Oct 2020 16:10:02 +0000 X-Inumbo-ID: 58938394-22fa-4520-8430-193962dc4735 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 58938394-22fa-4520-8430-193962dc4735; Wed, 14 Oct 2020 16:10:00 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1602691799; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=koDW1ZCC/VC0xA34aReXt7n81VfkMgCPkcz9C6Wbfcc=; b=NOaMDIt9D/DLqCTA0XTh4+slPUIp1K8yWz4RolDu0/jOKMsULQW88R6TZsbFmn+dYRHRZD 3qSnVm7LWUwDMWr6rfjXK62sniMBy+k4ZSIrWgiFARjsd+j/ZVurukGaLC9WQAPYXZZZJd rF3eRDqcblxFsZMjRHfLkEnyx8y02KE= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id B83B2AB95; Wed, 14 Oct 2020 16:09:59 +0000 (UTC) Subject: Re: [PATCH 2/2] x86/mwait-idle: Customize IceLake server support To: Igor Druzhinin Cc: xen-devel@lists.xenproject.org, andrew.cooper3@citrix.com, roger.pau@citrix.com, wl@xen.org, jun.nakajima@intel.com, kevin.tian@intel.com, Chen Yu , "Rafael J . Wysocki" References: <1602558169-23140-1-git-send-email-igor.druzhinin@citrix.com> <1602558169-23140-2-git-send-email-igor.druzhinin@citrix.com> From: Jan Beulich Message-ID: <13a10ad7-fc10-d055-3780-6d1a2be13549@suse.com> Date: Wed, 14 Oct 2020 18:09:58 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.1 MIME-Version: 1.0 In-Reply-To: <1602558169-23140-2-git-send-email-igor.druzhinin@citrix.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit On 13.10.2020 05:02, Igor Druzhinin wrote: > From: Chen Yu > > On ICX platform, the C1E auto-promotion is enabled by default. > As a result, the CPU might fall into C1E more offen than previous > platforms. So disable C1E auto-promotion and expose C1E as a separate > idle state. > > Beside C1 and C1E, the exit latency of C6 was measured > by a dedicated tool. However the exit latency(41us) exposed > by _CST is much smaller than the one we measured(128us). This > is probably due to the _CST uses the exit latency when woken > up from PC0+C6, rather than PC6+C6 when C6 was measured. Choose > the latter as we need the longest latency in theory. > > Signed-off-by: Chen Yu > Signed-off-by: Rafael J. Wysocki > [Linux commit a472ad2bcea479ba068880125d7273fc95c14b70] > Signed-off-by: Igor Druzhinin Acked-by: Jan Beulich