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[35.194.87.55]) by smtp.gmail.com with ESMTPSA id bp9-20020a05620a458900b0078812f8a042sm6307036qkb.90.2024.03.07.09.57.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Mar 2024 09:57:55 -0800 (PST) Date: Thu, 07 Mar 2024 12:57:55 -0500 From: Willem de Bruijn To: Marcelo Tosatti , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Willem de Bruijn , Jakub Kicinski , Eric Dumazet , Frederic Weisbecker , Valentin Schneider , Paolo Abeni Message-ID: <65ea00236e921_106619294ea@willemb.c.googlers.com.notmuch> In-Reply-To: References: Subject: Re: [PATCH net-next -v5] net/core/dev.c: enable timestamp static key if CPU isolation is configured Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Marcelo Tosatti wrote: > > For systems that use CPU isolation (via nohz_full), creating or destroying > a socket with SO_TIMESTAMP, SO_TIMESTAMPNS or SO_TIMESTAMPING with flag > SOF_TIMESTAMPING_RX_SOFTWARE will cause a static key to be enabled/disabled. > This in turn causes undesired IPIs to isolated CPUs. > > So enable the static key unconditionally, if CPU isolation is enabled, > thus avoiding the IPIs. > > Signed-off-by: Marcelo Tosatti Reviewed-by: Willem de Bruijn