From fa99165cc87a306d11ef6752e606e3f07b1a994e Mon Sep 17 00:00:00 2001 From: Marcos Paulo de Souza Date: Tue, 3 Sep 2019 08:05:37 -0600 Subject: [PATCH] Documentation:kernel-per-CPU-kthreads.txt: Remove reference to elevator= This argument was not being considered since blk-mq was set by default, so removed this documentation to avoid confusion. Reviewed-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Signed-off-by: Marcos Paulo de Souza .txt file is now .rst Signed-off-by: Jens Axboe --- 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().