From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 39474A04A9; Tue, 8 Feb 2022 04:50:31 +0100 (CET) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id B1F644014E; Tue, 8 Feb 2022 04:50:30 +0100 (CET) Received: from rs224.mailgun.us (rs224.mailgun.us [209.61.151.224]) by mails.dpdk.org (Postfix) with UTF8SMTP id 4C64E40141 for ; Tue, 8 Feb 2022 04:50:29 +0100 (CET) DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=tbrindus.ca; q=dns/txt; s=mailo; t=1644292229; h=Content-Transfer-Encoding: MIME-Version: Message-Id: Date: Subject: Cc: To: From: Sender; bh=JKHeTf0duulqmc5aMHjlerkOo9fyNJYq9dekqhtGmD0=; b=YrAIOtXjg2LuE+ALrI6sZpcqH2FfrZ1NAMP38pSv0k8yHYcJccvP2w6zqYGqG1zO1k5dt51V jKPJfndZKZmdfJqU6ImwlyWaKX+gBH4gGkx0yHhqAM8Eeh/107Z5m0M5qUpg6r/x8HsDTFwW gcoGPqDYF+LXh1oLW8tiriam/FI= X-Mailgun-Sending-Ip: 209.61.151.224 X-Mailgun-Sid: WyI3NWQzMCIsICJkZXZAZHBkay5vcmciLCAiNWYxMDE5Il0= Received: from lynwood.myfiosgateway.com (pool-100-37-145-117.nycmny.fios.verizon.net [100.37.145.117]) by smtp-out-n06.prod.us-west-2.postgun.com with SMTP id 6201e884b360e81798202da8 (version=TLS1.3, cipher=TLS_AES_128_GCM_SHA256); Tue, 08 Feb 2022 03:50:28 GMT Sender: me@tbrindus.ca From: Tudor Brindus To: Cc: dev@dpdk.org, Tudor Brindus Subject: [PATCH] doc: nohz_full already implies rcu_nocbs Date: Mon, 7 Feb 2022 22:50:18 -0500 Message-Id: <20220208035018.795361-1-me@tbrindus.ca> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 >From Documentation/admin-guide/kernel-parameters.txt, specifically the last sentence: nohz_full= [KNL,BOOT,SMP,ISOL] The argument is a cpu list, as described above. In kernels built with CONFIG_NO_HZ_FULL=y, set the specified list of CPUs whose tick will be stopped whenever possible. The boot CPU will be forced outside the range to maintain the timekeeping. Any CPUs in this list will have their RCU callbacks offloaded, just as if they had also been called out in the rcu_nocbs= boot parameter. The kernel or-s the nohz_full cpumask into the rcu_nocbs cpumask at startup, and uses that. Signed-off-by: Tudor Brindus --- doc/guides/howto/pvp_reference_benchmark.rst | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/doc/guides/howto/pvp_reference_benchmark.rst b/doc/guides/howto/pvp_reference_benchmark.rst index 484de3b7db..1043356b3d 100644 --- a/doc/guides/howto/pvp_reference_benchmark.rst +++ b/doc/guides/howto/pvp_reference_benchmark.rst @@ -48,7 +48,7 @@ Host tuning .. code-block:: console - intel_pstate=disable mce=ignore_ce default_hugepagesz=1G hugepagesz=1G hugepages=6 isolcpus=2-7 rcu_nocbs=2-7 nohz_full=2-7 iommu=pt intel_iommu=on + intel_pstate=disable mce=ignore_ce default_hugepagesz=1G hugepagesz=1G hugepages=6 isolcpus=2-7 nohz_full=2-7 iommu=pt intel_iommu=on #. Disable hyper-threads at runtime if necessary or if BIOS is not accessible: @@ -278,7 +278,7 @@ Guest tuning .. code-block:: console - default_hugepagesz=1G hugepagesz=1G hugepages=1 intel_iommu=on iommu=pt isolcpus=1,2 rcu_nocbs=1,2 nohz_full=1,2 + default_hugepagesz=1G hugepagesz=1G hugepages=1 intel_iommu=on iommu=pt isolcpus=1,2 nohz_full=1,2 #. Disable NMIs: -- 2.30.2