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deepin: Use BFQ as the elevator for SQ rotate devices #421

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deepin: Use BFQ as the elevator for SQ rotate devices #421

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Commits on Sep 16, 2024

  1. deepin: Use BFQ as the elevator for SQ devices 

    For hdd optimize.
Question: 
1.How to test QUEUE_FLAG_NONROT?
2.It is correct time to get the flag?？
3.If we can get the flag,so we can only use BFQ elevator for hdd.

Link:zen-kernel/zen-kernel@c614dbb
    @opsiff
    opsiff authored Sep 16, 2024
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  2. deepin: only use BFQ as the elevator for single queue rotate devices 

    Why: bfq elevator shows high bandwidth in read/write than other in hdd.[1]

Question:
It is correct time to get the flag?

If we can get the flag,so we can only use BFQ elevator for hdd.
or it is same as before.

Answer:
It is ok for:
use this macro:blk_queue_flag_set(QUEUE_FLAG_NONROT
for no rotate block device like ssd:
blk_queue_flag_set(QUEUE_FLAG_NONROT
device_add_disk->
elevator_init_mq->
elevator_get_default-> choose mq-deadline
for rotate device like hdd:
device_add_disk->
elevator_init_mq->
elevator_get_default-> choose bfq

Link:https://ieeexplore.ieee.org/document/7469567 [1]

Signed-off-by: Wentao Guan <[email protected]>
    @opsiff
    opsiff committed Sep 16, 2024
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