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Documentation:kernel-per-CPU-kthreads.txt: Remove reference to elevator=

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This argument was not being considered since blk-mq was set by default,
so removed this documentation to avoid confusion.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Marcos Paulo de Souza <marcos.souza.org@gmail.com>

.txt file is now .rst

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Marcos Paulo de Souza 2019-09-03 08:05:37 -06:00 committed by Jens Axboe
parent f97eeb6cfd
commit fa99165cc8
1 changed files with 3 additions and 5 deletions
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Documentation/admin-guide/kernel-per-CPU-kthreads.rst
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@ -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().