如何选择 mq-deadline 调度程序?

如何选择 mq-deadline 调度程序?

我正在尝试选择新的 mq-deadline io 调度程序,但它似乎不可用。

$ cat /sys/block/sda/queue/scheduler 
noop [deadline] 

核心:

$ uname -a
Linux pluto 4.11.6-zenbook #1 SMP Wed Jun 21 09:39:34 EDT 2017 x86_64 GNU/Linux

消息:

$ sudo dmesg|grep deadline
[    0.077863] TSC deadline timer enabled
[    1.383260] io scheduler deadline registered (default)
[    1.383261] io scheduler mq-deadline registered

答案1

您还需要启用CONFIG_SCSI_MQ_DEFAULT

Symbol: SCSI_MQ_DEFAULT [=y]
Type  : boolean
Prompt: SCSI: use blk-mq I/O path by default
  Location:
    -> Device Drivers
      -> SCSI device support
  Defined at drivers/scsi/Kconfig:50
  Depends on: SCSI [=y]

$ cat /sys/block/sda/queue/scheduler
[mq-deadline] none

答案2

您只需要在内核命令行上指定这些参数:

scsi_mod.use_blk_mq=1 elevator=mq-deadline

来源 :https://wiki.archlinux.org/index.php/improving_performance#Changing_I.2FO_scheduler

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