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[Filesystems] Add many udev rules to improve SATA SSD performance

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Especially when NCQ is disabled (as is the case with Samsung 850 EVO).
This commit is contained in:
Antoine Viallon 2023-04-08 19:38:17 +02:00
parent c42d6c3fdb
commit 734380265e
Signed by: aviallon
GPG key ID: 186FC35EDEB25716
1 changed files with 24 additions and 1 deletions
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25
filesystems.nix
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@ -79,7 +79,30 @@ in
''ACTION!="remove", SUBSYSTEM=="block", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="${cfg.hddScheduler}"''
)
(optional (!(builtins.isNull cfg.slowFlashScheduler))
''ACTION!="remove", SUBSYSTEM=="block", KERNEL=="sd[a-z]*|nvme[0-9]*n[0-9]*|mmcblk[0-9]*", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="${cfg.slowFlashScheduler}"''
''
SUBSYSTEM!="block", GOTO="end"
KERNEL!="sd[a-z]|nvme[0-9]*n[0-9]*|mmcblk[0-9]", GOTO="end"
ATTR{queue/rotational}!="0", GOTO="end"
ACTION!="remove", ATTR{queue/scheduler}="${cfg.slowFlashScheduler}"
# If possible, disable back_seek_penalty as it is effectively null on SSDs
ACTION!="remove", TEST=="queue/iosched/back_seek_penalty", ATTR{queue/iosched/back_seek_penalty}="0"
# BEGIN: NCQ disabled
ACTION!="remove", ATTR{device/queue_depth}!="1", GOTO="no_ncq_end"
# Increase maximum requests in software queue
ACTION!="remove", ATTR{queue/nr_requests}="256"
# If possible, prefer throughput over latency
ACTION!="remove", TEST=="queue/iosched/low_latency", ATTR{queue/iosched/low_latency}="1"
LABEL="no_ncq_end"
# END: NCQ disabledf
LABEL="end"
''
)
(optional (!(builtins.isNull cfg.nvmeScheduler))
''ACTION!="remove", SUBSYSTEM=="block", KERNEL=="nvme[0-9]*n[0-9]", ATTR{queue/scheduler}="${cfg.nvmeScheduler}"''