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docs: block: update and fix tiny error for bfq

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The max value of blkio.bfq.weight is 1000, rather than 10000.
And 'weights' have been remove from /sys/block/XXX/queue/iosched.

Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Acked-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yufen Yu 2020-07-03 02:13:23 -04:00 committed by Jens Axboe
parent 3197d48a7c
commit 65752aef0a
1 changed files with 1 additions and 8 deletions
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9
Documentation/block/bfq-iosched.rst
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@ -492,13 +492,6 @@ set max_budget to higher values than those to which BFQ would have set
it with auto-tuning. An alternative way to achieve this goal is to it with auto-tuning. An alternative way to achieve this goal is to
just increase the value of timeout_sync, leaving max_budget equal to 0. just increase the value of timeout_sync, leaving max_budget equal to 0.
weights
-------
Read-only parameter, used to show the weights of the currently active
BFQ queues.
4. Group scheduling with BFQ 4. Group scheduling with BFQ
============================ ============================
@ -566,7 +559,7 @@ Parameters to set
For each group, there is only the following parameter to set. For each group, there is only the following parameter to set.
weight (namely blkio.bfq.weight or io.bfq-weight): the weight of the weight (namely blkio.bfq.weight or io.bfq-weight): the weight of the
group inside its parent. Available values: 1..10000 (default 100). The group inside its parent. Available values: 1..1000 (default 100). The
linear mapping between ioprio and weights, described at the beginning linear mapping between ioprio and weights, described at the beginning
of the tunable section, is still valid, but all weights higher than of the tunable section, is still valid, but all weights higher than
IOPRIO_BE_NR*10 are mapped to ioprio 0. IOPRIO_BE_NR*10 are mapped to ioprio 0.