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 mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by smtp.lore.kernel.org (Postfix) with ESMTP id D454CE6BF33 for ; Fri, 30 Jan 2026 18:15:14 +0000 (UTC) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 1B4BD402AF; Fri, 30 Jan 2026 19:15:14 +0100 (CET) Received: from mail-wm1-f43.google.com (mail-wm1-f43.google.com [209.85.128.43]) by mails.dpdk.org (Postfix) with ESMTP id E19E94025F for ; Fri, 30 Jan 2026 19:15:12 +0100 (CET) Received: by mail-wm1-f43.google.com with SMTP id 5b1f17b1804b1-47ee0291921so22567675e9.3 for ; Fri, 30 Jan 2026 10:15:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20230601.gappssmtp.com; s=20230601; t=1769796912; x=1770401712; darn=dpdk.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=gYD0YGgJS2VZ3RrDF9oeM2X5iPzHLFRd+g/YwePRuYk=; b=KpVY3GqUmSym+hRRutr+x3x3BeiRhCjfpwhdvGy0XxnUbx/oq7pZBhA2DYp9ExxLO7 INi3fE9hhlD8GAfbX3pgve7ikxzgjgJpyPNlxKS4bOaBLLKMpasReuh6rxRhYQhPy9CS 6LHEuYWUcHHFiej8jf4GIe3LtItAMob5hr0XkTrfScmMhVUBD4k4wamQpd3L1S+Fz0o5 CkpxhpOEps6g9NHI6S6VKRCBfGlhMpPUJ2d6gFND3kKJv8x8PT8QxzcltaCzf0r+Ai2L OYggKzSEMhrqMlxktXvsF6baPvxlsBOMsqKxhgdRaZ8jsgQrS4ComtWUqVnvyCRzY6mU 6b5w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769796912; x=1770401712; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=gYD0YGgJS2VZ3RrDF9oeM2X5iPzHLFRd+g/YwePRuYk=; b=ZsPRabhQALXrPO+Kajj2RP7jF53jFT5gxGegNfWXUn3inQPmi7WsIR8gzo+5rRMqrv 37MBmE+EH9oMjvzuZy/93vKokanOfs1Rd+1yxxu4SQdvvf/UQn3+LNRdaoY61Rva4VLc 7ZypPnnauR4x0e/ZZ/xiYpKgONfADLSPU+z5JorLkpRxI4WsfvGRurmgTUdXDlWJeZBj fUbOSh7NYT1ZPfdhsmLQN4lNDxmmiKjIndaTLAHAuuvEJcyFmX+zno9RRgf2Fg41Nefr rNx/NMJjGjrQG4R+/7jrzOUgNWjndyd96ofRT765GROKCxovm1Pa23OpoqDNnMRYVSDP OXog== X-Gm-Message-State: AOJu0YyJMSMMS+X3gSXUfTYfhAKljS2kpjGTPORlzTTqc70EYn3J0PWZ /dv/UnBJ1TY7LNyOfV/k+UKnbjA4nlUniTf4r0rZl0YJ6vTT51Xctz4UDUV5r2uO9L0= X-Gm-Gg: AZuq6aLJj9Xfdbx4qFTrxP8uJ4WWTy6zl8+eATBu5R5K8VsVGnb9HEqyqgRSVcvsMIt 6DzJQsXXlRt+t7XkOCf8kK712/T3lUJ+Xe6PMNPXRIfswvC3NFqwJKffSExUz8GAKbo1DcmwCGS Xes73DjEmI2IrjvSXZCXeP6271gam7IlXqrgruiB93noMdCMPKONtPh/gnfZu7DFn5jXTJ1JaNk 3qFgvBeCptQy0xF+6jAxh4r5bsU+Xuwl5I3h6qBBpYLJ827odp2NpGeYp6/CsNLWOWEPrHGBAp3 1LRKN5S5xZ+Gkazdaf8dv5lJZxvmPgyChSGLQWBGRAkhVYEA+stlg1HXrDmou4th3qAp7/1Qwye JjxMmossM4BXn0CIVI/ysq+8fqnLFxEUX1KAFfd0wR8TC/nT8FAh5WNV5Sht8PAmFyMhrw4I9Ht MWQN3Yk0YzDmOid7PfGJD4B2auWtE3BHFOqvinN7UzNylZ3R23fGjzP9jdecY/Vuk= X-Received: by 2002:a05:600c:310f:b0:477:7ae0:cd6e with SMTP id 5b1f17b1804b1-482db493e6bmr45030585e9.5.1769796912254; Fri, 30 Jan 2026 10:15:12 -0800 (PST) Received: from phoenix.local (204-195-96-226.wavecable.com. [204.195.96.226]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4806cdeafffsm200505285e9.7.2026.01.30.10.15.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Jan 2026 10:15:12 -0800 (PST) Date: Fri, 30 Jan 2026 10:15:06 -0800 From: Stephen Hemminger To: Thomas Monjalon Cc: dev@dpdk.org, stable@dpdk.org, Luigi Rizzo , Bruce Richardson , Konstantin Ananyev , Sergio Gonzalez Monroy , Harry van Haaren Subject: Re: [PATCH] eal/x86: fix TSC frequency query Message-ID: <20260130101506.175ca913@phoenix.local> In-Reply-To: <20260130171026.277418-1-thomas@monjalon.net> References: <20260130171026.277418-1-thomas@monjalon.net> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org On Fri, 30 Jan 2026 18:10:26 +0100 Thomas Monjalon wrote: > After getting TSC information from cpuid instruction, > some values must be multiplied and divided. > We must multiply first to get the most accurate value. > > Example: > before: 1000000000 * (23 / 10) = 2 GHz > after: 1000000000 * 23 / 10 = 2.3 GHz > > Bugzilla ID: 1869 > Fixes: ad3516bb4ae1 ("eal/x86: implement arch-specific TSC freq query") > Cc: stable@dpdk.org > > Reported-by: Luigi Rizzo > Signed-off-by: Thomas Monjalon Reviewed-by: Stephen Hemminger