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[200.146.53.87]) by smtp.gmail.com with ESMTPSA id p59sm5684085qtd.75.2019.09.01.16.28.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 01 Sep 2019 16:28:08 -0700 (PDT) From: Marcos Paulo de Souza To: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, axboe@kernel.dk Cc: Marcos Paulo de Souza , Hannes Reinecke Subject: [PATCH v2 4/4] Documentation:kernel-per-CPU-kthreads.txt: Remove reference to elevator= Date: Sun, 1 Sep 2019 20:29:16 -0300 Message-Id: <20190901232916.4692-5-marcos.souza.org@gmail.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190901232916.4692-1-marcos.souza.org@gmail.com> References: <20190828011930.29791-5-marcos.souza.org@gmail.com> <20190901232916.4692-1-marcos.souza.org@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This argument was not being considered since blk-mq was set by default, so removed this documentation to avoid confusion. Signed-off-by: Marcos Paulo de Souza Reviewed-by: Hannes Reinecke --- Documentation/admin-guide/kernel-per-CPU-kthreads.rst | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/Documentation/admin-guide/kernel-per-CPU-kthreads.rst b/Documentation/admin-guide/kernel-per-CPU-kthreads.rst index 4f18456dd3b1..baeeba8762ae 100644 --- a/Documentation/admin-guide/kernel-per-CPU-kthreads.rst +++ b/Documentation/admin-guide/kernel-per-CPU-kthreads.rst @@ -274,9 +274,7 @@ To reduce its OS jitter, do any of the following: (based on an earlier one from Gilad Ben-Yossef) that reduces or even eliminates vmstat overhead for some workloads at https://lkml.org/lkml/2013/9/4/379. - e. Boot with "elevator=noop" to avoid workqueue use by - the block layer. - f. If running on high-end powerpc servers, build with + e. If running on high-end powerpc servers, build with CONFIG_PPC_RTAS_DAEMON=n. This prevents the RTAS daemon from running on each CPU every second or so. (This will require editing Kconfig files and will defeat @@ -284,12 +282,12 @@ To reduce its OS jitter, do any of the following: due to the rtas_event_scan() function. WARNING: Please check your CPU specifications to make sure that this is safe on your particular system. - g. If running on Cell Processor, build your kernel with + f. If running on Cell Processor, build your kernel with CBE_CPUFREQ_SPU_GOVERNOR=n to avoid OS jitter from spu_gov_work(). WARNING: Please check your CPU specifications to make sure that this is safe on your particular system. - h. If running on PowerMAC, build your kernel with + g. If running on PowerMAC, build your kernel with CONFIG_PMAC_RACKMETER=n to disable the CPU-meter, avoiding OS jitter from rackmeter_do_timer(). -- 2.22.0