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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 9D99BC10F16 for ; Mon, 6 May 2024 13:25:10 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.717649.1120066 (Exim 4.92) (envelope-from ) id 1s3yKq-0000BO-Ue; Mon, 06 May 2024 13:24:52 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 717649.1120066; Mon, 06 May 2024 13:24:52 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1s3yKq-0000BH-S4; Mon, 06 May 2024 13:24:52 +0000 Received: by outflank-mailman (input) for mailman id 717649; Mon, 06 May 2024 13:24:51 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1s3yKp-0008MO-IH for xen-devel@lists.xenproject.org; Mon, 06 May 2024 13:24:51 +0000 Received: from mail-lf1-x134.google.com (mail-lf1-x134.google.com [2a00:1450:4864:20::134]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 03ce3cc9-0bac-11ef-b4bb-af5377834399; Mon, 06 May 2024 15:24:49 +0200 (CEST) Received: by mail-lf1-x134.google.com with SMTP id 2adb3069b0e04-51f8211c588so1926150e87.0 for ; Mon, 06 May 2024 06:24:49 -0700 (PDT) Received: from [10.156.60.236] (ip-037-024-206-209.um08.pools.vodafone-ip.de. [37.24.206.209]) by smtp.gmail.com with ESMTPSA id h11-20020adfe98b000000b00343d1d09550sm10711581wrm.60.2024.05.06.06.24.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 06 May 2024 06:24:49 -0700 (PDT) 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" X-Inumbo-ID: 03ce3cc9-0bac-11ef-b4bb-af5377834399 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1715001889; x=1715606689; darn=lists.xenproject.org; h=content-transfer-encoding:in-reply-to:autocrypt:from:references:cc :to:content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=KiJBdPPRY/NUJaEPZJ4xZh1WqKJ1mjEkLa8gfRm5A6Y=; b=UlVSrjDVNUhau509H15lwlJvQ8V23Dl+RDWxuvaYw0iXwv6S+vW6aSxFu6CRHwb0dN ILjGkSug+ZpHNS1pcgN/LHGetnGNY4LdIfW6S0jrnZVJSHDIAyWDBT1VhN1hMQ5sMsMw 121JVGgVGBgd7tQFkPIcQmm0jKWWVIUyMsZYwZgdhZHdvfFQcbRfxrfjkfRf7jHlnBTx kaIhKacBa2N6jYh38MD0rK2WdTenvzLvyoodtVUT8BqOGD2XR7Zz2AMoAV3vFW0DGsta W03h2GzshuKfKiKS5qUbcvZvTwSBYL+LTLFolhbB5MMseEWidQCuBJGm9b1FVHOYOscO rfRw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1715001889; x=1715606689; h=content-transfer-encoding:in-reply-to:autocrypt:from:references:cc :to:content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=KiJBdPPRY/NUJaEPZJ4xZh1WqKJ1mjEkLa8gfRm5A6Y=; b=CqWM0/E4FLVymoY/L4r8v6DVPX/qFfgbVPXvm3mtqRxBBdphtKdCCFRvgZwCcTam+B o/J4ntQoKHfs5VWBvU5zykiDfydBW71YypB1sRVCrKqTlN7Hqtkcf9TmwHFt3f+00lI4 AqGUgrRH8jXJG/fsoUSafu67p6qUGTJ0T+RCadDcdUaFjduAyVkjr+fLPDVkNhh2HBy6 it56Cpek7GyJNGdtY3C6hdZ4WYpI6tx33tXDBNyhrsOwVn6sPTAoxoRreYDQia1D4A3v iIpOg6sZ3k6Lqm4R23f9JVfkBxOpDtAR6pFCzGpM5uKQXPNUxImICO+wnxYMjVC9neg/ CVig== X-Forwarded-Encrypted: i=1; AJvYcCVpkaXL7RVUpF+RmQj8BTkqWfBVE3FHzLsztDidophgDhFMfeudixFn2raQNg+YBUYDpXWfY3bFvlLpjSeFu7pwXbAWVaTaaiwSuVpYmZ0= X-Gm-Message-State: AOJu0YwI87VRruSQBmBSYHYIth2K/ScVebytgzjRpDtA2zf6huQykoGf cA1Ad8jeZdFhPyjVJNjsc/sNVHoXKELfZFNOwniXlVe5q4ZhaOfUHJHLGHDH5w== X-Google-Smtp-Source: AGHT+IGewT+MutigeIuDr5hJAY1fGM1J73lQvtbidYmsNdhZ9inG1Z/Zt9Hiebjk7BgodK5Iz+Y8SA== X-Received: by 2002:ac2:4959:0:b0:51d:abb3:d701 with SMTP id o25-20020ac24959000000b0051dabb3d701mr6568286lfi.5.1715001889409; Mon, 06 May 2024 06:24:49 -0700 (PDT) Message-ID: <01bd95f8-9122-41dd-9bc4-0fb6bbea1f6c@suse.com> Date: Mon, 6 May 2024 15:24:50 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 11/13] xen/arm: add Xen cache colors command line parameter Content-Language: en-US To: Carlo Nonato Cc: andrea.bastoni@minervasys.tech, Luca Miccio , Andrew Cooper , George Dunlap , Julien Grall , Stefano Stabellini , Marco Solieri , xen-devel@lists.xenproject.org References: <20240502165533.319988-1-carlo.nonato@minervasys.tech> <20240502165533.319988-12-carlo.nonato@minervasys.tech> From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: <20240502165533.319988-12-carlo.nonato@minervasys.tech> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 02.05.2024 18:55, Carlo Nonato wrote: > From: Luca Miccio > > Add a new command line parameter to configure Xen cache colors. > These colors are dumped together with other coloring info. > > Benchmarking the VM interrupt response time provides an estimation of > LLC usage by Xen's most latency-critical runtime task. Results on Arm > Cortex-A53 on Xilinx Zynq UltraScale+ XCZU9EG show that one color, which > reserves 64 KiB of L2, is enough to attain best responsiveness: > - Xen 1 color latency: 3.1 us > - Xen 2 color latency: 3.1 us > > Since this is the most common target for Arm cache coloring, the default > amount of Xen colors is set to one. > > More colors are instead very likely to be needed on processors whose L1 > cache is physically-indexed and physically-tagged, such as Cortex-A57. > In such cases, coloring applies to L1 also, and there typically are two > distinct L1-colors. Therefore, reserving only one color for Xen would > senselessly partitions a cache memory that is already private, i.e. > underutilize it. > > Signed-off-by: Luca Miccio > Signed-off-by: Marco Solieri > Signed-off-by: Carlo Nonato Reviewed-by: Jan Beulich