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Performance evaluation showed that using the mq-deadline scheduler for DASD devices leads to a significantly higher CPU consumption compared to using none scheduler while having the same amount of throughput. Setting none scheduler as default in the dasd udev rule. Signed-off-by: Stefan Haberland <sth@linux.ibm.com> Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
36 lines
1.3 KiB
Plaintext
36 lines
1.3 KiB
Plaintext
#
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# Rules for unique DASD device nodes created in /dev/disk/
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# This file should be installed in /etc/udev/rules.d
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#
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SUBSYSTEM!="block", GOTO="dasd_symlinks_end"
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KERNEL!="dasd*", GOTO="dasd_symlinks_end"
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ACTION!="change", GOTO="dasd_block_end"
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# by-id (hardware serial number)
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KERNEL=="dasd*[!0-9]", ATTRS{status}=="online", IMPORT{program}="/sbin/dasdinfo -a -e -b $kernel"
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KERNEL=="dasd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_SERIAL}"
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KERNEL=="dasd*[!0-9]", ENV{ID_UID}=="?*", SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_UID}"
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KERNEL=="dasd*[!0-9]", ENV{ID_XUID}=="?*", SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_XUID}"
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LABEL="dasd_block_end"
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ACTION!="change|add", GOTO="dasd_symlinks_end"
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# for partitions import parent information
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KERNEL=="dasd*[0-9]", IMPORT{parent}=="ID_*"
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KERNEL=="dasd*[0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_SERIAL}-part%n"
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KERNEL=="dasd*[0-9]", ENV{ID_UID}=="?*", SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_UID}-part%n"
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KERNEL=="dasd*[0-9]", ENV{ID_XUID}=="?*", SYMLINK+="disk/by-id/$env{ID_BUS}-$env{ID_XUID}-part%n"
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LABEL="dasd_symlinks_end"
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# on device add set request queue scheduler to none
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SUBSYSTEM!="block", GOTO="sched_end"
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ACTION!="change", GOTO="sched_end"
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KERNEL=="dasd*[!0-9]", TEST=="queue/scheduler", ATTR{queue/scheduler}="none"
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LABEL="sched_end"
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